Method and device for transmitting and receiving wireless signal in wireless communication system

ABSTRACT

A method for a terminal to transmit or receive a signal in a wireless communication system according to an embodiment of the present invention can include: monitoring physical downlink control channel (PDCCH) candidates; obtaining downlink control information (DCI) through a PDCCH detected in a first slot as a result of monitoring the PDCCH candidates; and receiving a physical downlink shared channel (PDSCH) or transmitting a physical uplink shared channel (PUSCH) in a second slot on the basis of the DCI.

This application is a continuation of International Application No.PCT/KR2020/010156 filed Jul. 31, 2020 and published Feb. 25, 2021 as WO2021/033952 A1, which claims priority to Korean Patent Application No.10-2019-0100633 filed Aug. 16, 2019, the contents of which are herebyincorporated by reference herein in their entirety.

TECHNICAL FIELD

The present disclosure relates to a wireless communication system, andmore particularly, to a method and apparatus for transmitting/receivinga wireless signal.

BACKGROUND ART

Generally, a wireless communication system is developing to diverselycover a wide range to provide such a communication service as an audiocommunication service, a data communication service and the like. Thewireless communication is a sort of a multiple access system capable ofsupporting communications with multiple users by sharing availablesystem resources (e.g., bandwidth, transmit power, etc.). For example,the multiple access system may be any of a code division multiple access(CDMA) system, a frequency division multiple access (FDMA) system, atime division multiple access (TDMA) system, an orthogonal frequencydivision multiple access (OFDMA) system, and a single carrier frequencydivision multiple access (SC-FDMA) system.

DETAILED DESCRIPTION OF THE DISCLOSURE Technical Problem

An object of the present disclosure is to provide a method ofefficiently performing wireless signal transmission/reception proceduresand an apparatus therefor.

It will be appreciated by persons skilled in the art that the objectsthat could be achieved with the present disclosure are not limited towhat has been particularly described hereinabove and the above and otherobjects that the present disclosure could achieve will be more clearlyunderstood from the following detailed description.

Technical Solution

According to an aspect of the present disclosure, provided herein is amethod of transmitting or receiving a signal by a user equipment (UE) ina wireless communication system, including monitoring physical downlinkcontrol channel (PDCCH) candidates; obtaining downlink controlinformation (DCI) through a PDCCH detected in a first slot as a resultof monitoring the PDCCH candidates; and receiving a physical downlinkshared channel (PDSCH) or transmitting a physical uplink shared channel(PUSCH) in a second slot based on the DCI. The DCI may schedulereception of the PDSCH or transmission of the PUSCH in a secondbandwidth part (BWP) configured with a second subcarrier spacing (SCS).The DCI may include information about a slot offset ‘K’ between thefirst slot and the second slot. The UE may determine the second slot inwhich reception of the PDSCH or transmission of the PUSCH is to beperformed based on the slot offset ‘K’.

In another aspect of the present disclosure, provided herein is a userequipment (UE) for wireless communication, including a transceiver; andat least one processor configured to control the transceiver. The atleast one processor may be configured to monitor physical downlinkcontrol channel (PDCCH) candidates, acquire downlink control information(DCI) through a PDCCH detected in a first slot as a result of monitoringthe PDCCH candidates, and receive a physical downlink shared channel(PDSCH) or transmit a physical uplink shared channel (PUSCH) in a secondslot, based on the DCI, through the transceiver. The DCI may schedulereception of the PDSCH or transmission of the PUSCH in a secondbandwidth part (BWP) configured with a second subcarrier spacing (SCS)and the DCI may be configured to include information about a slot offset‘K’ between the first slot and the second slot. The at least oneprocessor may determine the second slot in which reception of the PDSCHor transmission of the PUSCH is to be performed based on the slot offset‘K’.

In another aspect of the present disclosure, provided herein is a devicefor performing signal processing for wireless communication, includingat least one processor configured to execute one or more instructions;and a memory configured to provide a reading/writing space in the atleast one processor. The at least one processor may be configured toperform signal processing related to monitoring of physical downlinkcontrol channel (PDCCH) candidates based on execution of the one or moreinstructions, acquire downlink control information (DCI) through a PDCCHdetected in a first slot as a result of monitoring the PDCCH candidates,and perform signal processing related to reception of a physicaldownlink shared channel (PDSCH) or transmission of a physical uplinkshared channel (PUSCH) in a second slot based on the DCI. The DCI mayschedule reception of the PDSCH or transmission of the PUSCH in a secondbandwidth part (BWP) configured with a second subcarrier spacing (SCS)and the DCI may be configured to include information about a slot offset‘K’ between the first slot and the second slot. The at least oneprocessor may determine the second slot in which reception of the PDSCHor transmission of the PUSCH is to be performed based on the slot offset‘K’.

In another aspect of the present disclosure, provided herein is a methodof transmitting or receiving a signal by a base station (BS) in awireless communication system, including generating downlink controlinformation (DCI); transmitting a physical downlink control channel(PDCCH) carrying the DCI through a candidate in a first slot among PDCCHcandidates; and transmitting a physical downlink shared channel (PDSCH)or transmitting a physical uplink shared channel (PUSCH), scheduled bythe DCI in a second slot. The DCI may schedule transmission of the PDSCHor reception of the PUSCH in a second bandwidth part (BWP) configuredwith a second subcarrier spacing (SCS) and the DCI may be configured toinclude information about a slot offset ‘K’ between the first slot andthe second slot. The BS may indicate the second slot) in whichtransmission of the PDSCH or reception of the PUSCH is to be performedbased on the slot offset “K.

In another aspect of the present disclosure, provided herein is a basestation (BS) for wireless communication, including a transceiver; and atleast one processor configured to generate downlink control information(DCI), wherein the at least one processor may be configured to controlthe transceiver to transmit a physical downlink control channel (PDCCH)carrying the DCI through a candidate in a first slot among PDCCHcandidates, and transmit a physical downlink shared channel (PDSCH) ortransmit a physical uplink shared channel (PUSCH), scheduled by the DCIin a second slot. The DCI may schedule transmission of the PDSCH orreception of the PUSCH in a second bandwidth part (BWP) configured witha second subcarrier spacing (SCS) and the DCI may be configured toinclude information about a slot offset ‘K’ between the first slot andthe second slot. The at least one processor may indicate the second slotin which transmission of the PDSCH or reception of the PUSCH is to beperformed based on the slot offset ‘K’,

A minimum value ‘Min_K’ for the slot offset ‘K’ in the second BWP may bedetermined based on a first SCS configured in a first BWP different fromthe second BWP

A ratio between the second SCS and the first SCS may be used todetermine the minimum value ‘Min_K’ based on that the first BWP and thesecond BWP are different from each other.

The UE (or the device) may not be expected to receive the PDSCH ortransmit the PUSCH in a slot related to a ‘K’ value smaller than thedetermined minimum value ‘Min_K’. The BS may not expect the UE (or thedevice) will receive the PDSCH or transmit the PUSCH in a slot relatedto a ‘K’ value smaller than the determined minimum value ‘Min_K’.

The UE (or the device) may assume that the DCI will not indicate a ‘K’value ‘K’ smaller than the determined minimum value ‘Min_K’ in a processof monitoring the PDCCH candidates and acquiring the DCI. The BS maygenerate the DCI so as not to indicate a ‘K’ value ‘K’ smaller than thedetermined minimum value ‘Min_K’.

The first BWP may be a BWP which has been previously used by the UE (orthe device).

The minimum value ‘Min_K’ may be determined to be proportional to theratio between the second SCS and the first SCS.

The minimum value ‘Min_K’ may be determined based on “2^(μ2)/2^(μ1)”,where ‘μ1’ may be a value denoting the first SCS configured in the firstBWP and ‘μ2’ may be a value denoting the second SCS configured in thesecond BWP. The minimum value “Min_K may be determined based on‘(2^(μ2)/2^(μ1))*min_Slot_Offset’, where ‘min_Slot_Offset’ may denotethe minimum value ‘Min_K’ configured in the first BWP.

A BWP in which the PDCCH is detected may be different from the secondBWP in which reception of the PDSCH or transmission of the PUSCH isperformed.

The UE (or the device) may receive at least one of a first time domainresource allocation (TDRA) table related to the PDSCH or a second TDRAtable related to the PUSCH, through radio resource control (RRC)signaling. The first TDRA table may include one or more PDCCH-to-PDSCHslot offset ‘K0’ values. The second TDRA table may include one or morePDCCH-to-PUSCH slot offset ‘K2’ values. The slot offset ‘K’ may be oneof the ‘K0’ values of the first TDRA table or one of the ‘K2’ values ofthe second TDRA table.

The UE (or device) may assume that, based on the minimum value ‘Min_K’,which is a minimum value ‘Min_K0’ related to the PDSCH, a value smallerthan the minimum value ‘Min_K0’ among the ‘K0’ values of the first TDRAtable is not indicated ‘Min_K0’ ‘K0’ by the slot offset ‘K’. The UE (ordevice) may assume that, based on the minimum value ‘Min_K’ which is aminimum value ‘Min_K2’ related to the PUSCH, a value smaller than theminimum value ‘Min_K2’ among the ‘K2’ values of the second TDRA table isnot indicated ‘Min_K2’ ‘K2’ by the slot offset ‘K’. The BS may generatethe DCI such that, based on the minimum value ‘Min_K’, which is aminimum value ‘Min_K0’ related to the PDSCH, a value smaller than theminimum value ‘Min_K0’ among the ‘K0’ values of the first TDRA table isnot indicated ‘Min_K0’ ‘K0’ by the slot offset ‘K’. The BS may generatethe DCI such that, based on the minimum value ‘Min_K’ which is a minimumvalue ‘Min_K2’ related to the PUSCH, a value smaller than the minimumvalue ‘Min_K2’ among the ‘K2’ values of the second TDRA table is notindicated ‘Min_K2’ ‘K2’ by the slot offset ‘K’.

The UE (or the device) or the BS may determine a minimum value ‘Min_K0’as the minimum value ‘Min_K’ related to the PDSCH and determines aminimum value ‘Min_K2’ as the minimum value ‘Min_K’ related to thePUSCH. The minimum value ‘Min_K0’ and the minimum value ‘Min_K2’ may bedetermined independently of each other.

The UE may perform monitoring the PDCCH candidates in a specific BWP ofa first component carrier (CC) among a plurality of CCs configured forthe UE. The UE may perform reception of the PDSCH or transmission of thePUSCH in a second CC including the second BWP. The UE may determine thesecond slot using a minimum value ‘Min_K’ configured for the specificBWP of the first CC. The second slot is slot #(n+m+k), where “slot #n”may denote a slot having a lowest index among slots of the second BWPoverlapping with a slot of the specific BWP in which the PDCCH isdetected, “m” may denote the minimum value ‘Min_K’ configured for thespecific BWP as the number of slots in the second BWP, and “k” maydenote a slot offset indicated by the DCI as the number of slots in thesecond BWP.

In another aspect of the present disclosure, provided herein is aprocessor-readable recording medium in which a program for performingthe method of transmitting or receiving a signal by the UE/BS isrecorded.

Advantageous Effects

According to the present disclosure, wireless signal transmission andreception may be efficiently performed in a wireless communicationsystem.

It will be appreciated by persons skilled in the art that the effectsthat can be achieved with the present disclosure are not limited to whathas been particularly described hereinabove and other advantages of thepresent disclosure will be more clearly understood from the followingdetailed description taken in conjunction with the accompanyingdrawings.

DESCRIPTION OF DRAWINGS

The accompanying drawings, which are included to provide a furtherunderstanding of the disclosure and are incorporated in and constitute apart of this application, illustrate embodiments of the disclosure andtogether with the description serve to explain the principle of thedisclosure. In the drawings:

FIG. 1 illustrates physical channels used in a 3rd generationpartnership project (3GPP) system as an exemplary wireless communicationsystem, and a general signal transmission method using the same;

FIG. 2 illustrates a radio frame structure;

FIG. 3 illustrates a resource grid of a slot;

FIG. 4 illustrates exemplary mapping of physical channels in a slot;

FIG. 5 is a diagram illustrating a signal flow for a physical downlinkcontrol channel (PDCCH) transmission and reception process;

FIGS. 6 and 7 illustrate exemplary control resource set (CORESET)structures;

FIGS. 8 to 12 illustrate various examples of a dynamic slot offsetindication according to an embodiment of the present disclosure;

FIGS. 13 and 14 illustrate signal transmission and reception accordingto an embodiment of the present disclosure;

FIG. 15 illustrates a network access procedure applicable to the presentdisclosure;

FIGS. 16 to 19 illustrate a communication system 1 and wireless devicesapplicable to the present disclosure; and

FIG. 20 illustrates a discontinuous reception (DRX) operation applicableto the present disclosure.

BEST MODE FOR CARRYING OUT THE DISCLOSURE

Embodiments of the present disclosure are applicable to a variety ofwireless access technologies such as code division multiple access(CDMA), frequency division multiple access (FDMA), time divisionmultiple access (TDMA), orthogonal frequency division multiple access(OFDMA), and single carrier frequency division multiple access(SC-FDMA). CDMA can be implemented as a radio technology such asUniversal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA can beimplemented as a radio technology such as Global System for Mobilecommunications (GSM)/General Packet Radio Service (GPRS)/Enhanced DataRates for GSM Evolution (EDGE). OFDMA can be implemented as a radiotechnology such as Institute of Electrical and Electronics Engineers(IEEE) 802.11 (Wireless Fidelity (Wi-Fi)), IEEE 802.16 (Worldwideinteroperability for Microwave Access (WiMAX)), IEEE 802.20, and EvolvedUTRA (E-UTRA). UTRA is a part of Universal Mobile TelecommunicationsSystem (UMTS). 3rd Generation Partnership Project (3GPP) Long TermEvolution (LTE) is part of Evolved UMTS (E-UMTS) using E-UTRA, andLTE-Advanced (A) is an evolved version of 3GPP LTE. 3GPP NR (New Radioor New Radio Access Technology) is an evolved version of 3GPP LTE/LTE-A.

As more and more communication devices require a larger communicationcapacity, there is a need for mobile broadband communication enhancedover conventional radio access technology (RAT). In addition, massiveMachine Type Communications (MTC) capable of providing a variety ofservices anywhere and anytime by connecting multiple devices and objectsis another important issue to be considered for next generationcommunications. Communication system design considering services/UEssensitive to reliability and latency is also under discussion. As such,introduction of new radio access technology considering enhanced mobilebroadband communication (eMBB), massive MTC, and Ultra-Reliable and LowLatency Communication (URLLC) is being discussed. In the presentdisclosure, for simplicity, this technology will be referred to as NR(New Radio or New RAT).

For the sake of clarity, 3GPP NR is mainly described, but the technicalidea of the present disclosure is not limited thereto.

In a wireless communication system, a user equipment (UE) receivesinformation through downlink (DL) from a base station (BS) and transmitinformation to the BS through uplink (UL). The information transmittedand received by the BS and the UE includes data and various controlinformation and includes various physical channels according totype/usage of the information transmitted and received by the UE and theBS.

FIG. 1 illustrates physical channels used in a 3GPP NR system and ageneral signal transmission method using the same.

When a UE is powered on again from a power-off state or enters a newcell, the UE performs an initial cell search procedure, such asestablishment of synchronization with a BS, in step S101. To this end,the UE receives a synchronization signal block (SSB) from the BS. TheSSB includes a primary synchronization signal (PSS), a secondarysynchronization signal (SSS), and a physical broadcast channel (PBCH).The UE establishes synchronization with the BS based on the PSS/SSS andacquires information such as a cell identity (ID). The UE may acquirebroadcast information in a cell based on the PBCH. The UE may receive aDL reference signal (RS) in an initial cell search procedure to monitora DL channel status.

After initial cell search, the UE may acquire more specific systeminformation by receiving a physical downlink control channel (PDCCH) andreceiving a physical downlink shared channel (PDSCH) based oninformation of the PDCCH in step S102.

The UE may perform a random access procedure to access the BS in stepsS103 to S106. For random access, the UE may transmit a preamble to theBS on a physical random access channel (PRACH) (S103) and receive aresponse message for preamble on a PDCCH and a PDSCH corresponding tothe PDCCH (S104). In the case of contention-based random access, the UEmay perform a contention resolution procedure by further transmittingthe PRACH (S105) and receiving a PDCCH and a PDSCH corresponding to thePDCCH (S106).

After the foregoing procedure, the UE may receive a PDCCH/PDSCH (S107)and transmit a physical uplink shared channel (PUSCH)/physical uplinkcontrol channel (PUCCH) (S108), as a general downlink/uplink signaltransmission procedure. Control information transmitted from the UE tothe BS is referred to as uplink control information (UCI). The UCIincludes hybrid automatic repeat and requestacknowledgement/negative-acknowledgement (HARQ-ACK/NACK), schedulingrequest (SR), channel state information (CSI), etc. The CSI includes achannel quality indicator (CQI), a precoding matrix indicator (PMI), arank indicator (RI), etc. While the UCI is transmitted on a PUCCH ingeneral, the UCI may be transmitted on a PUSCH when control informationand traffic data need to be simultaneously transmitted. In addition, theUCI may be aperiodically transmitted through a PUSCH according torequest/command of a network.

FIG. 2 illustrates a radio frame structure. In NR, uplink and downlinktransmissions are configured with frames. Each radio frame has a lengthof 10 ms and is divided into two 5-ms half-frames (HF). Each half-frameis divided into five 1-ms subframes (SFs). A subframe is divided intoone or more slots, and the number of slots in a subframe depends onsubcarrier spacing (SCS). Each slot includes 12 or 14 OrthogonalFrequency Division Multiplexing (OFDM) symbols according to a cyclicprefix (CP). When a normal CP is used, each slot includes 14 OFDMsymbols. When an extended CP is used, each slot includes 12 OFDMsymbols.

Table 1 exemplarily shows that the number of symbols per slot, thenumber of slots per frame, and the number of slots per subframe varyaccording to the SCS when the normal CP is used.

TABLE 1 SCS (15*2^(u)) N^(slot) _(symb) N^(frame, u) _(slot)N^(subframe, u) _(slot)  15 KHz (u = 0) 14 10 1  30 KHz (u = 1) 14 20 2 60 KHz (u = 2) 14 40 4 120 KHz (u = 3) 14 80 8 240 KHz (u = 4) 14 16016 *N^(slot) _(symb): Number of symbols in a slot *N^(frame, u) _(slot):Number of slots in a frame *N^(subframe, u) _(slot): Number of slots ina subframe

Table 2 illustrates that the number of symbols per slot, the number ofslots per frame, and the number of slots per subframe vary according tothe SCS when the extended CP is used.

TABLE 2 SCS (15*2^(u)) N^(slot) _(symb) N^(frame, u) _(slot)N^(subframe, u) _(slot) 60 KHz (u = 2) 12 40 4

The structure of the frame is merely an example. The number ofsubframes, the number of slots, and the number of symbols in a frame mayvary.

In the NR system, OFDM numerology (e.g., SCS) may be configureddifferently for a plurality of cells aggregated for one UE. Accordingly,the (absolute time) duration of a time resource (e.g., an SF, a slot ora TTI) (for simplicity, referred to as a time unit (TU)) consisting ofthe same number of symbols may be configured differently among theaggregated cells. Here, the symbols may include an OFDM symbol (or aCP-OFDM symbol) and an SC-FDMA symbol (or a discrete Fouriertransform-spread-OFDM (DFT-s-OFDM) symbol).

FIG. 3 illustrates a resource grid of a slot. A slot includes aplurality of symbols in the time domain. For example, when the normal CPis used, the slot includes 14 symbols. However, when the extended CP isused, the slot includes 12 symbols. A carrier includes a plurality ofsubcarriers in the frequency domain. A resource block (RB) is defined asa plurality of consecutive subcarriers (e.g., 12 consecutivesubcarriers) in the frequency domain. A bandwidth part (BWP) may bedefined to be a plurality of consecutive physical RBs (PRBs) in thefrequency domain and correspond to a single numerology (e.g., SCS, CPlength, etc.). The carrier may include up to N (e.g., 5) BWPs. Datacommunication may be performed through an activated BWP, and only oneBWP may be activated for one UE. In the resource grid, each element isreferred to as a resource element (RE), and one complex symbol may bemapped to each RE.

FIG. 4 illustrates exemplary mapping of physical channels in a slot. Inthe NR system, a frame is characterized by a self-contained structure inwhich all of a DL control channel, DL or UL data, and a UL controlchannel may be included in one slot. For example, the first N symbols(hereinafter, referred to as a DL control region) of a slot may be usedto transmit a DL control channel (e.g., PDCCH), and the last M symbols(hereinafter, referred to as a UL control region) of the slot may beused to transmit a UL control channel (e.g., PUCCH). Each of N and M isan integer equal to or larger than 0. A resource region (hereinafter,referred to as a data region) between the DL control region and the ULcontrol region may be used to transmit DL data (e.g., PDSCH) or UL data(e.g., PUSCH). A guard period (GP) provides a time gap for transmissionmode-to-reception mode switching or reception mode-to-transmission modeswitching at a BS and a UE. Some symbol at the time of DL-to-ULswitching in a subframe may be configured as a GP.

The PDCCH delivers DCI. For example, the PDCCH (i.e., DCI) may carryinformation about a transport format and resource allocation of a DLshared channel (DL-SCH), resource allocation information of an uplinkshared channel (UL-SCH), paging information on a paging channel (PCH),system information on the DL-SCH, information on resource allocation ofa higher-layer control message such as an RAR transmitted on a PDSCH, atransmit power control command, information about activation/release ofconfigured scheduling, and so on. The DCI includes a cyclic redundancycheck (CRC). The CRC is masked with various identifiers (IDs) (e.g. aradio network temporary identifier (RNTI)) according to an owner orusage of the PDCCH. For example, if the PDCCH is for a specific UE, theCRC is masked by a UE ID (e.g., cell-RNTI (C-RNTI)). If the PDCCH is fora paging message, the CRC is masked by a paging-RNTI (P-RNTI). If thePDCCH is for system information (e.g., a system information block(SIB)), the CRC is masked by a system information RNTI (SI-RNTI). Whenthe PDCCH is for an RAR, the CRC is masked by a random access-RNTI(RA-RNTI).

FIG. 5 is a diagram illustrating a signal flow for a PDCCH transmissionand reception process.

Referring to FIG. 5 , a BS may transmit a control resource set (CORESET)configuration to a UE (S502). A CORSET is defined as a resource elementgroup (REG) set having a given numerology (e.g., an SCS, a CP length,and so on). An REG is defined as one OFDM symbol by one (P)RB. Aplurality of CORESETs for one UE may overlap with each other in thetime/frequency domain. A CORSET may be configured by system information(e.g., a master information block (MIB)) or higher-layer signaling(e.g., radio resource control (RRC) signaling). For example,configuration information about a specific common CORSET (e.g., CORESET#0) may be transmitted in an MIB. For example, a PDSCH carrying systeminformation block 1 (SIB1) may be scheduled by a specific PDCCH, andCORSET #0 may be used to carry the specific PDCCH. Configurationinformation about CORESET #N (e.g., N>0) may be transmitted by RRCsignaling (e.g., cell-common RRC signaling or UE-specific RRCsignaling). For example, the UE-specific RRC signaling carrying theCORSET configuration information may include various types of signalingsuch as an RRC setup message, an RRC reconfiguration message, and/or BWPconfiguration information. Specifically, a CORSET configuration mayinclude the following information/fields.

-   -   controlResourceSetId: indicates the ID of a CORESET.    -   frequencyDomainResources: indicates the frequency resources of        the CORESET. The frequency resources of the CORESET are        indicated by a bitmap in which each bit corresponds to an RBG        (e.g., six (consecutive) RBs). For example, the most significant        bit (MSB) of the bitmap corresponds to a first RBG. RBGs        corresponding to bits set to 1 are allocated as the frequency        resources of the CORESET.    -   duration: indicates the time resources of the CORESET. Duration        indicates the number of consecutive OFDM symbols included in the        CORESET. Duration has a value of 1 to 3.    -   cce-REG-MappingType: indicates a control channel element        (CCE)-REG mapping type. Interleaved and non-interleaved types        are supported.    -   interleaverSize: indicates an interleaver size.    -   pdcch-DMRS-ScramblingID: indicates a value used for PDCCH DMRS        initialization. When pdcch-DMRS-ScramblingID is not included,        the physical cell ID of a serving cell is used.    -   precoderGranularity: indicates a precoder granularity in the        frequency domain.    -   reg-BundleSize: indicates an REG bundle size.    -   tci-PresentInDCI: indicates whether a transmission configuration        index (TCI) field is included in DL-related DCI.    -   tci-StatesPDCCH-ToAddList: indicates a subset of TCI states        configured in pdcch-Config, used for providing quasi-co-location        (QCL) relationships between DL RS(s) in an RS set (TCI-State)        and PDCCH DMRS ports.

Further, the BS may transmit a PDCCH search space (SS) configuration tothe UE (S504). The PDCCH SS configuration may be transmitted byhigher-layer signaling (e.g., RRC signaling). For example, the RRCsignaling may include, but not limited to, various types of signalingsuch as an RRC setup message, an RRC reconfiguration message, and/or BWPconfiguration information. While a CORESET configuration and a PDCCH SSconfiguration are shown in FIG. 5 as separately signaled, forconvenience of description, the present disclosure is not limitedthereto. For example, the CORESET configuration and the PDCCH SSconfiguration may be transmitted in one message (e.g., by one RRCsignaling) or separately in different messages.

The PDCCH SS configuration may include information about theconfiguration of a PDCCH SS set. The PDCCH SS set may be defined as aset of PDCCH candidates monitored (e.g., blind-detected) by the UE. Oneor more SS sets may be configured for the UE. Each SS set may be a USSset or a CSS set. For convenience, PDCCH SS set may be referred to as“SS” or “PDCCH SS”.

A PDCCH SS set includes PDCCH candidates. A PDCCH candidate is CCE(s)that the UE monitors to receive/detect a PDCCH. The monitoring includesblind decoding (BD) of PDCCH candidates. One PDCCH (candidate) includes1, 2, 4, 8, or 16 CCEs according to an aggregation level (AL). One CCEincludes 6 REGs. Each CORESET configuration is associated with one ormore SSs, and each SS is associated with one CORESET configuration. OneSS is defined based on one SS configuration, and the SS configurationmay include the following information/fields.

-   -   searchSpaceId: indicates the ID of an SS.    -   controlResourceSetId: indicates a CORESET associated with the        SS.    -   monitoringSlotPeriodicityAndOffset: indicates a periodicity (in        slots) and offset (in slots) for PDCCH monitoring.    -   monitoringSymbolsWithinSlot: indicates the first OFDM symbol(s)        for PDCCH monitoring in a slot configured with PDCCH monitoring.        The first OFDM symbol(s) for PDCCH monitoring is indicated by a        bitmap with each bit corresponding to an OFDM symbol in the        slot. The MSB of the bitmap corresponds to the first OFDM symbol        of the slot. OFDM symbol(s) corresponding to bit(s) set to 1        corresponds to the first symbol(s) of a CORESET in the slot.    -   nrofCandidates: indicates the number of PDCCH candidates (one of        values 0, 1, 2, 3, 4, 5, 6, and 8) for each AL where AL={1, 2,        4, 8, 16}.    -   searchSpaceType: indicates common search space (CSS) or        UE-specific search space (USS) as well as a DCI format used in        the corresponding SS type.

Subsequently, the BS may generate a PDCCH and transmit the PDCCH to theUE (S506), and the UE may monitor PDCCH candidates in one or more SSs toreceive/detect the PDCCH (S508). An occasion (e.g., time/frequencyresources) in which the UE is to monitor PDCCH candidates is defined asa PDCCH (monitoring) occasion. One or more PDCCH (monitoring) occasionsmay be configured in a slot.

Table 3 shows the characteristics of each SS.

TABLE 3 Search Type Space RNTI Use Case Type0- Common SI-RNTI on aprimary cell SIB PDCCH Decoding Type0A- Common SI-RNTI on a primary cellSIB PDCCH Decoding Type1- Common RA-RNTI or TC-RNTI on a Msg2, Msg4PDCCH primary cell decoding in RACH Type2- Common P-RNTI on a primarycell Paging PDCCH Decoding Type3- Common INT-RNTI, SFI-RNTI, TPC- PDCCHPUSCH-RNTI, TPC-PUCCH- RNTI, TPC-SRS-RNTI, C- RNTI, MCS-C-RNTI, or CS-RNTI(s) UE C-RNTI, or MCS-C-RNTI, or User specific Specific CS-RNTI(s)PDSCH decoding

Table 4 shows DCI formats transmitted on the PDCCH.

TABLE 4 DCI format Usage 0_0 Scheduling of PUSCH in one cell 0_1Scheduling of PUSCH in one cell 1_0 Scheduling of PDSCH in one cell 1_1Scheduling of PDSCH in one cell 2_0 Notifying a group of UEs of the slotformat 2_1 Notifying a group of UEs of the PRB(s) and OFDM symbol(s)where UE may assume no transmission is intended for the UE 2_2Transmission of TPC commands for PUCCH and PUSCH 2_3 Transmission of agroup of TPC commands for SRS transmissions by one or more UEs

DCI format 0_0 may be used to schedule a TB-based (or TB-level) PUSCH,and DCI format 0_1 may be used to schedule a TB-based (or TB-level)PUSCH or a code block group (CBG)-based (or CBG-level) PUSCH. DCI format1_0 may be used to schedule a TB-based (or TB-level) PDSCH, and DCIformat 1_1 may be used to schedule a TB-based (or TB-level) PDSCH or aCBG-based (or CBG-level) PDSCH (DL grant DCI). DCI format 0_0/0_1 may bereferred to as UL grant DCI or UL scheduling information, and DCI format1_0/1_1 may be referred to as DL grant DCI or DL scheduling information.DCI format 2_0 is used to deliver dynamic slot format information (e.g.,a dynamic slot format indicator (SFI)) to a UE, and DCI format 2_1 isused to deliver DL pre-emption information to a UE. DCI format 2_0and/or DCI format 2_1 may be delivered to a corresponding group of UEson a group common PDCCH which is a PDCCH directed to a group of UEs.

DCI format 0_0 and DCI format 1_0 may be referred to as fallback DCIformats, whereas DCI format 0_1 and DCI format 1_1 may be referred to asnon-fallback DCI formats. In the fallback DCI formats, a DCI size/fieldconfiguration is maintained to be the same irrespective of a UEconfiguration. In contrast, the DCI size/field configuration variesdepending on a UE configuration in the non-fallback DCI formats.

A CCE-to-REG mapping type is set to one of an interleaved type and anon-interleaved type.

-   -   Non-interleaved CCE-to-REG mapping (or localized CCE-to-REG        mapping) (FIG. 5 ): 6 REGs for a given CCE are grouped into one        REG bundle, and all of the REGs for the given CCE are        contiguous. One REG bundle corresponds to one CCE.    -   Interleaved CCE-to-REG mapping (or distributed CCE-to-REG        mapping) (FIG. 6 ): 2, 3 or 6 REGs for a given CCE are grouped        into one REG bundle, and the REG bundle is interleaved within a        CORESET. In a CORESET including one or two OFDM symbols, an REG        bundle includes 2 or 6 REGs, and in a CORESET including three        OFDM symbols, an REG bundle includes 3 or 6 REGs. An REG bundle        size is configured on a CORESET basis.

In the NR system, information related to a time interval between DL/ULscheduling DCI-to-DL/UL data transmission and reception and/orinformation related to a HARQ timing may be dynamically indicatedthrough DCI of a PDCCH.

Hereinafter, for convenience of description, K0, K1, or K2 will bedefined as a time (e.g., slot) interval between “Slot A” and “Slot B” asshown in Table 5 below.

TABLE 5 Slot A Slot B K0 DL scheduling DCI Corresponding DL DataTransmission K1 DL data reception Corresponding HARQ-ACK K2 ULscheduling DCI Corresponding UL Data Transmission

FIG. 8 is a diagram for explaining a method of dynamically indicating aninterval (e.g., DL/UL scheduling-to-data transmission or HARQ timing)between slots through DCI of a PDCCH.

Referring to FIG. 8 , there are illustrated (i) a time interval (K0=3slots) between a slot to which a PDCCH carrying DL scheduling DCI ismapped and a slot to which a PDSCH carrying DL data is mapped, (ii) atime interval (K1=4 slots) between a slot to which the PDSCH carryingthe DL data is mapped and a slot to which HARQ-ACK information (e.g., aPUCCH carrying HARQ-ACK information) is mapped, and (iii) a timeinterval (K2=4 slots) between a slot to which a PDCCH carrying ULscheduling DCI is mapped and a slot to which a PUSCH carrying UL data ismapped. The time interval K0, K1, or K2 may be expressed as an offset ofa slot unit. While, in FIG. 8 , it is assumed that a channel carryingthe HARQ-ACK information is assumed to be the PUCCH, the HARQ-ACKinformation of the PUCCH may be transmitted by being piggybacked on thePUSCH and the PUCCH may be dropped, according to an embodiment.

As an example, a network may configure a set of X (1≤X) K0 values {firstK0 value, second K0 value, third K0 value . . . . N-th K0 value} for aUE through higher layer signaling (e.g., UE-specific RRC signaling) andindicate any one within the set of the X K0 values through DL grant DCI.The UE may perform DL data (e.g., PDSCH) reception based on the K0 valueindicated through the DCI. The network may configure a set of Y (1≤Y) K1values {first K1 value, second K1 value, third K1 value . . . . Y-th K1value} for the UE through higher layer signaling (e.g., UE-specific RRCsignaling) and indicate any one within the set of the Y K1 valuesthrough the DL grant DCI. The UE may perform HARQ-ACK transmission(e.g., PUCCH) for DL data based on the K1 value indicated through the DLgrant DCI. The network may configure a set of Z (1≤Z) K2 values {firstK2 value, second K2 value, third K2 value . . . Z-th K2 value} for theUE through higher layer signaling (e.g., UE-specific RRC signaling) andindicate any one within the set of the Z K2 values through UL grant DCI.The UE may perform UL data (e.g., PUSCH) transmission based on the K2value indicated through the UL grant DCI. Each of the set of the K0values, the set of the K1 values, and/or the set of the K2 values may beconfigured in the form of a list (or table) and may be referred to as atime domain resource allocation (TDRA) table or TDRA list. For example,the set of the K0 values may be referred to as a PDSCH-TDRA list (ortable), and the set of the K1 values may be referred to as a PUSCH-TDRAlist (or table).

Before the UE receives the PDSCH-TDRA list through RRC signaling (e.g.,a procedure of setting up an RRC connection), a predefined default K0value may be applied to an SIB received through the PDSCH. The defaultK0 value may be a value defined in Section 5.1.2.1 of 3GPP NR standarddocument TS 38.214.

As DL grant DCI of a PDCCH mapped to slot #n indicates the value of K0,a PDSCH scheduled by the DL grant DCI may be mapped to slot #n+K0. Ifthe DL grant DCI of the PDCCH indicates the K1 value and the PDSCHscheduled by the DL grant DCI is mapped to slot #m, HARQ-ACK for thecorresponding PDSCH may be mapped to slot #m+K1. When UL grant DCI ofthe PDCCH mapped to the slot #n indicates the K2 value, a PUSCHscheduled by the UL grant DCI may be mapped to slot #n+K2.

FIG. 9 is a diagram for explaining a method of dynamically indicating aninterval between slots (e.g., DL/UL scheduling-to-data transmission orHARQ timing) through DCI of a PDCCH when cross-carrier scheduling isused.

The numerology of component carrier (CC) #1 in which a scheduling PDCCHis transmitted and the numerology of CC #2 in which a scheduledPDSCH/PUCCH is transmitted may be configured identically or differently.For convenience, while, in FIG. 9 , it is assumed that the SCS of CC #1is 15 kHz and the SCS of CC #2 is 60 kHz, they may be changed to variousother SCSs, and the number of CCs may be configured such that 2 or moreCCs are configured for one UE. A CC may be simply referred to as acarrier or may be referred to as a serving cell. Alternatively, in eachembodiment to be described later, the term “CC” may bechanged/replaced/substituted to/with “bandwidth part (BWP)”. Forexample, “a plurality of CCs” may be changed to “a plurality of BWPs”,and “cross-carrier scheduling” may be replaced with “cross-BWPscheduling”. In addition, in cross-BWP scheduling, a scheduling BWP anda scheduled BWP may be included in the same CC or may be included indifferent CCs. For example, a scheduling BWP of a scheduling CC mayschedule a PDCCH and/or a PUSCH in a scheduled BWP of a scheduled CC.

In the case of cross-carrier scheduling between CCs of different SCSs asillustrated in FIG. 9 , the time granularity of K0 or K2 indicated bythe DCI may be indicated/configured/interpreted by K0 or K2 based on theSCS of CC #2 in which PDCCH/PUSCH transmission is performed.

In addition, when a slot corresponding to K0=0 or a slot correspondingto K2=0 is referred to as a reference slot, each reference slot isdetermined as the first slot in CC #2 overlapping the slot of CC #1 towhich the PDCCH is mapped.

The start symbol of the PDSCH is expressed as “S0” and the symbolduration of the PDSCH is expressed as “L0”. A set of {S0, L0, K0} may bedynamically indicated. Specifically, the network may configure X (1≤X){S0, L0, K0} sets, such as {S0, L0, K0}=Set #0, . . . Set #X, for the UEthrough higher layer signaling (e.g., RRC signaling). The network mayindicate (e.g., joint-indicate) any one of the X sets through a DL grantPDCCH (i.e., a specific field of the DL grant DCI). The UE may receivethe PDSCH (i.e., DL data) based on the value of {S0, L0, K0} indicatedthrough the DL grant PDCCH.

In addition, the start symbol of HARQ-ACK transmission for DL data(e.g., the start symbol of a PUCCH carrying HARQ-ACK information) isexpressed as “S1”, and the symbol duration of HARQ-ACK transmission isexpressed as “L1”. {S1, L1} and K1 may be dynamically indicated throughthe DL grant PDCCH (i.e., DL grant DCI). For example, {S1, L1} and K1may be separately indicated through specific fields of the DL grant DCI.Specifically, the network may configure U (1≤U) {S1, L1} sets, such as{S1, L1}=Set #0, . . . Set #P, for the UE through higher layer signaling(e.g., RRC signaling) and configure Y K1 values for the UE. Any one ofthe U {S1, L1} sets may be indicated through a first field (e.g.,ACK/NACK resource indication (ARI) field) of the DL grant DCI, and anyone of U K1 values may be indicated through a second field (e.g.,ACK/NACK timing indicator (ATI) field). The UE may transmit HARQ-ACK(e.g., a PUCCH carrying HARQ-ACK information) for DL data, based on the{S1, L1} and the K1 value, indicated through the DL grant PDCCH.

In addition, the start symbol of the PUSCH is expressed as “S2” and thesymbol duration of the PDSCH is expressed as “L2”. A set of {S2, L2, K2}may be dynamically indicated. Specifically, the network may configure Z(1≤Z) {S2, L2, K2} sets, such as {S2, L2, K2}=Set #0, . . . Set #Z, forthe UE through higher layer signaling (e.g., RRC signaling). The networkmay indicate (e.g., joint-indicate) any one of the Z sets through a ULgrant PDCCH (i.e., a specific field of the UL grant DCI). The UE maytransmit the PUSCH (i.e., UL data) based on the {S2, L2, K2} valueindicated through the UL grant PDCCH.

Continuous power consumption may occur while the UE receives a DLsignal. Assuming that the DL signal is a PDCCH, the UE may alwaysconsume power to perform the following operations during PDCCH reception(e.g., monitoring, blind decoding, or detection attempt). Suchoperations may ultimately entail unnecessary power consumption accordingto content actually indicated by the PDCCH.

1) During a PDCCH decoding delay time, a signal capable of transmittinga PDSCH that the corresponding PDCCH may potentially schedule is storedin a memory.

For example, when the UE attempts to blind-detect a PDCCH candidate on afirst time resource, the UE assumes that the PDCCH candidate may beactually detected as a PDCCH carrying DL grant DCI. In other words, onthe assumption that the DL grant DCI may schedule PDSCH transmissionafter the first time resource, the UE stores, in the memory (e.g., abuffer), DL signals on all time resources (e.g., a second time resource,a third time resource, etc.) on which the PDSCH may be scheduled inconsideration of the possibility of potential PDSCH reception until theblind detection process of the corresponding PDCCH candidate iscompleted. However, the corresponding PDCCH candidate may not include anactual PDCCH signal. In this case, the UE discards the DL signalsbuffered for the PDSCH. Such buffering may cause excessive powerconsumption in the UE. In addition, even if the corresponding PDCCHcandidate includes the actual PDCCH signal, if the PDSCH is scheduled onthe N-th time resource, the DL signals buffered on the second timeresource to the (N−1)-th time resource are also discarded.

2) When the PDCCH schedules the PUSCH, the UE performs PDCCH decoding ata fairly high clock in order to secure a PUSCH generation time. The UEdetermines a PDCCH decoding time by assuming the minimum number of slots(e.g. K2) of the TDRA table configured for the UE as an interval betweenthe PDCCH and a potential scheduled PUSCH.

For example, as described above, in a state in which a plurality ofK2values is configured for the UE through higher layer signaling, the UEblind-detecting the PDCCH candidate that may include UL grant DCIblind-decodes the PDCCH candidate at a high clock by assuming theminimum among the plural K2 values. However, even if the PDCCH candidateactually includes the UL grant DCI, there may be the case in which thecorresponding DCI indicates a sufficiently large K2 value rather thanthe minimum K2 value. High power consumption due to driving of ahigh-speed processor results in excessive power consumption.

3) In addition to the examples of 1) and 2), excessive power consumptionmay be caused in various operations of the UE. For example, inpreparation for the possibility that the PDCCH will indicate channelstate information-reference signal (CSI-RS) reception (e.g., aperiodicCSI report request) or sounding reference signal (SRS) transmission, aPDCCH decoding rate of the UE may be considerably high, and such a PDCCHdecoding rate may have a significant effect on power consumption of theUE in the end.

As such, in order to minimize unnecessary power consumption of the UEdue to the uncertain and potential indication of the PDCCH (e.g., datascheduling/HARQ-ACK transmission timing), the BS may additionallyconfigure scheduling delay information, which is a specific durationthat allows the UE not to expect data scheduling/HARQ-ACK within theTDRA table configured for the UE. This is referred to as “minimumapplicable K0”, “minimum applicable K1”, or “minimum applicable K2”. Forexample, the UE may blind-decode the PDCCH by assuming that a K0 valuesmaller than the “minimum applicable K0” will not be indicated throughthe DL grant DCI. Similarly, the UE may blind-decode the PDCCH byassuming that a K1 value smaller than the “minimum applicable K1” willnot be indicated through the DL grant DCI. In addition, the UE mayassume that a K2 value smaller than the “minimum applicable K2” will notbe indicated through the UL grant DCI. The minimum applicable K0, K1,and K2 values may have values larger than the minimum values of the K0,K1, and K2 values (e.g., values in the TDRA table) configured for theUE, respectively. The UE may expect that values smaller than the minimumapplicable K0 among K0 values configured through higher layer signalingwill not be used for PDSCH scheduling. The same expectation is possiblefor the K1 value or the K2 value.

In this way, the UE is allowed to expect that only a scheduling delay ofmore than a specific value larger than the minimum value of the TDRAtable will be used in the PDCCH, and thus the mentioned powerconsumption factors 1), 2), and 3) may be alleviated. In this case, if aCC or a BWP including the PDCCH monitored by the UE and a potential CCor a potential BWP that may include a signal/channel that the PDCCH mayschedule have different numerologies, the minimum applicable K0, K1, andK2 values to be used for a corresponding scheduled CC or BWP (a minimumapplicable scheduling delay, or a scheduling delay to be applied to thecorresponding scheduled CC or BWP) need to be newly defined or a rule ofapplying the minimum applicable K0, K1, and K2 values to the scheduledCC or BWP needs to be newly defined.

For example, referring back to FIG. 9 , an example in which schedulingdelay K0 or K2 is applied to a scheduled CC is illustrated in a state inwhich the numerologies of CC #1 in which the scheduling PDCCH istransmitted and CC #2 in which the scheduled PDSCH/PUCCH is transmittedare different. Specifically, when the PDCCH of CC #1 schedules the PDSCHof CC #2 and the K0 or K2 value is 4, the UE/BS interprets thescheduling delay K0 or K2 value based on the numerology of scheduled CC#2. However, since the UE monitoring the PDCCH in CC #1 is not aware ofwhether the PDCCH schedules the PDSCH/PUSCH of CC #1 (i.e., self-CCscheduling) or the PDSCH/PUSCH of CC #2 (i.e., cross-CC scheduling), itis necessary to consider both cases. For example, assume that theminimum applicable scheduling delay K0 or K2 value of 2 is given to CC#1. The UE should consider the possibility that the PDSCH/PUSCH isscheduled in CC #2 based on cross-CC scheduling in slot #n+1, which isthe next slot immediately after slot #n to which the PDCCH is mapped.Therefore, even if the minimum applicable scheduling delay K0 or K2value is given as 2 in CC #1, there is a problem in that the UE decodesthe PDCCH at a high rate in preparation for PDSCH reception/PUSCHtransmission in slot #n+1 rather than slot #n+2.

To solve this, if the minimum applicable scheduling delay K0 or K2 valueof 2 configured in CC #1 is scaled according to the numerology of CC #2,the minimum applicable scheduling delay K0 or K2 value incross-scheduled CC #2 is 8. As a result, the minimum applicablescheduling delay value becomes excessively large. For example, if themaximum value of the scheduling delay K0 or K2 value of the tableconfigured for the UE is 4, the minimum applicable scheduling delayvalue of 8 scaled for CC #2 may not exist in the TDRA table of the UE.The same problem may occur even in the case of K1.

Accordingly, an embodiment in which power consumption of the UE may bemaintained to be the same as in the case of self-CC scheduling whilesolving such a problem is disclosed.

Table 6 is an excerpt of the description of PDCCH-to-PDSCH specified inSection 5.1.2.1 of NR standard document TS 38.213 and a PDCCH-to-PUSCHtiming specified in Section 6.1.2.1 of NR standard document TS 38.213.As described above, the PDCCH-to-PDSCH slot offset ‘K0’ is indicated bythe DCI scheduling the PDSCH, and the PDCCH-to-PUSCH slot offset ‘K2’ isindicated by the DCI scheduling the PUSCH.

TABLE 6 [PDSCH transmission timing (TS 38.213 Section 5.1.2.1: Resourceallocation in time domain)]${{{The}\mspace{14mu}{slot}\mspace{14mu}{allocated}\mspace{14mu}{for}\mspace{14mu}{the}\mspace{14mu}{PDSCH}\mspace{14mu}{is}\mspace{14mu}\left\lfloor {n \cdot \frac{2^{PDCCH}}{2^{PDSCH}}} \right\rfloor} + K_{0}},{{where}\mspace{14mu} n\mspace{14mu}{is}}$the slot with the scheduling DCI (i.e., PDCCH), and K₀ is based on thenumerology of PDSCH, and P_(PDSCH) and P_(PDCCH) are the subcarrierspacing configurations for PDSCH and PDCCH, respectively. . . . [PUSCHtransmission timing (TS 38.213 Section: 6.1.2.1 Resource allocation intime domain)] The slot where the UE shall transmit the PUSCH isdetermined by${K_{2}\mspace{14mu}{as}\mspace{14mu}\left\lfloor {n \cdot \frac{2^{PDCCH}}{2^{PDSCH}}} \right\rfloor} + {K_{2}\mspace{14mu}{where}\mspace{14mu} n\mspace{14mu}{is}\mspace{14mu}{the}\mspace{14mu}{slot}\mspace{20mu}{with}\mspace{20mu}{the}\mspace{14mu}{scheduling}\mspace{14mu}{DCI}}$(i.e., PDCCH), K₂ is based on the numerology of PUSCH, and P_(PUSCH) andP_(PDCCH) are the subcarrier spacing configurations for PUSCH and PDCCH,respectively.

According to an embodiment of the present disclosure, when a first CC ora first BWP cross-schedules a channel/signal (e.g., PDSCH or PUSCH) in asecond CC or a second BWP having a different numerology (SCS) therefrom,the scheduling delay (K0 or K2) value for the second CC or the secondBWP expected by the UE may be defined as follows.

A slot offset K0_(Scheduled) applied to a scheduled CC or BWP may bedefined as min_K0_(Scheduling)×2^((uPDSCH-uPDCCH))+K0′.min_K0_(Scheduling) may denote a minimum applicable K0 value configuredin a scheduling CC or BWP. uPDSCH may denote a value corresponding tothe numerology of the scheduled CC or BWP among μ values of Table 7below (“Table 4.2-1: Supported transmission numerologies” of TS38.211).uPDCCH may denote a value corresponding to the numerology of ascheduling CC or BWP among the μ values in Table 7 below. K0′ may denotea K0 value (e.g., the number of slots based on the numerology of thescheduled CC or BWP) obtained by interpreting an indication of a DLgrant of the scheduling CC or BWP using a TDRA table of the scheduled CCor BWP. For example, when cross-CC/BWP scheduling is used, K0′ maydenote a value obtained by reinterpreting a K0 value indicated throughDCI based on an SCS of the corresponding scheduled CC or BWP. That is,K0′ may be the same as K0 determined according to the method of FIG. 9 .A slot corresponding to K0_(Scheduled)=0 may be the same as a slotcorresponding to K0=0 in the method of FIG. 9 .

According to this method, there is an advantage in that the minimumapplicable K0 value configured in the scheduling CC/BWP is guaranteedeven if cross-CC/BWP scheduling is used.

TABLE 7 μ Δf = 2^(μ) · 15 [kHz] Cyclic prefix 0 15 Normal 1 30 Normal 260 Normal, Extended 3 120 Normal 4 240 Normal

Additionally, even when DCI indicates CSI-RS reception, theK0_(Scheduled) value newly defined above may be applied as a minimumapplicable value (or gap) for CSI-RS reception.

As another example, the slot offset K0_(Scheduled) applied to thescheduled CC or BWP may also be defined asmin_K0_(Scheduling)×2^((uPDSCH-uPDCCH))+K0. Here, K0 may represent aslot offset indicated by the DCI, rather than K0′.

FIG. 11 illustrates[K0_(Scheduled)=min_K0_(Scheduling)×2^((uPDSCH-uPDCCH))+K0′], and FIG.12 illustrates[K0_(Scheduled)=min_K0_(Scheduling)×2^((uPDSCH-uPDCCH))+K0]. It isassumed in FIGS. 11 and 12 that min_K0_(Scheduling) (i.e., minimumapplicable K0 value configured in CC #1) is 2-slot, K0 of a 1-slot sizeis indicated through a specific field of the DCI, and a carrierindication field (CIF) of the DCI indicates CC #2.

In addition, a slot offset K2_(Scheduled) applied to the scheduled CC orBWP may be mi defined as min_K2_(Scheduling)×2^((uPDSCH-uPDCCH))+K2′.min_K2_(Scheduling) may denote a minimum applicable K2 value configuredin the scheduling CC or BWP. uPUSCH may denote a value corresponding tothe numerology of the scheduled CC or BWP among the μ values of Table 7.uPDCCH may denote a value corresponding to the numerology of thescheduling CC or BWP among the μ values of Table 7. K2′ may denote aK2value (e.g., the number of slots based on the numerology of thescheduled CC or BWP) obtained by interpreting an indication of a ULgrant of the scheduling CC or BWP using the TDRA table of the scheduledCC or BWP. For example, when cross-CC/BWP scheduling is used, K2′ maymean a value obtained by reinterpreting a K2value indicated through theDCI based on the SCS of the corresponding scheduled CC or BWP. That is,K2′ may be the same as K2determined according to the method of FIG. 9 .A slot corresponding to K2_(Scheduled)=0 may be the same as a slotcorresponding to K2=0 in the method of FIG. 9 .

According to this method, there is an advantage in that the minimumapplicable K2value configured in the scheduling CC/BWP is guaranteedeven if cross-CC/BWP scheduling is used.

Additionally, even when the DCI indicates SRS transmission, theK2_(Scheduled) value newly defined above may be applied as a minimumapplicable value (or gap) for SRS transmission.

As another example, the slot offset K2_(Scheduled) applied to thescheduled CC or BWP may be defined asmin_K2_(Scheduling)×2^((uPDSCH-uPDCCH))+K2. Here, K2 may represent theslot offset indicated by the DCI, rather than K2′,

According to the above-mentioned proposal, the regulation for thePDCCH-to-PDSCH/PUSCH timing of Table 7 may be modified as shown in Table8.

TABLE 8 [PDSCH transmission timing]${{{{The}\mspace{14mu}{slot}\mspace{14mu}{allocated}\mspace{14mu}{for}\mspace{14mu}{the}\mspace{14mu}{PDSCH}\mspace{14mu}{is}\mspace{14mu}\left\lfloor {n \cdot \frac{2^{PDCCH}}{2^{PDSCH}}} \right\rfloor} + K_{0\mspace{14mu}} + \mspace{11mu}{\min\mspace{14mu} K\; 0^{\prime}}}\;,}\;$where n is the slot with the scheduling DCI (i.e., PDCCH), and K₀ isbased on the numerology of PDSCH, and P_(PDSCH) and P_(PDCCH) are thesubcarrier spacing configurations for PDSCH and PDCCH, respectively. . .. [PUSCH transmission timing] The slot where the UE shall transmit thePUSCH is determined by${K_{2}\mspace{14mu}{as}\mspace{14mu}\left\lfloor {n \cdot \frac{2^{PDCCH}}{2^{PDSCH}}} \right\rfloor} + K_{2\mspace{14mu}} + \mspace{11mu}{\min\mspace{14mu} K\; 2^{\prime}\mspace{14mu}{where}\mspace{14mu} n\mspace{14mu}{is}\mspace{14mu}{the}\mspace{14mu}{slot}\mspace{14mu}{with}\mspace{14mu}{the}}$scheduling DCI (i.e., PDCCH), K₂ is based on the numerology of PUSCH,and P_(PUSCH) and P_(PDCCH) are the subcarrier spacing configurationsfor PUSCH and PDCCH, respectively.

As an example, in Table 8, min_K0′ may be defined as“min_K0_(Scheduling)×2^((uPDSCH-uPDCCH))” described above, and min_K2′may be defined as “min_K2_(Scheduling)×2^((uPDSCH-uPDCCH))” describedabove. In addition, min_K0′ and min_K2′ may be defined as minimumapplicable K0 and K2, respectively, according to the numerology of thescheduled CC/BWP.

FIG. 10 illustrates PDSCH reception based on cross-carrier schedulingwhen the proposal of Table 8 is not applied, and FIG. 11 illustratesPDSCH reception based on cross-carrier scheduling when the proposal ofTable 8 is not applied. The effect of FIG. 11 may be confirmed through acomparison between FIGS. 10 and 11 . In FIGS. 10 and 11 , it is assumedthat the minimum applicable K0 value of CC #1 is 2. In FIG. 10 , it isassumed that the PDSCH may exist in CC #2 when the UE monitors thePDCCH, so that the UE may not relax a PDCCH decoding rate. In contrast,FIG. 11 is advantageous in that the UE may lower the PDCCH decoding ratewhile the BS schedules the PDSCH using the same K0 value as in FIG. 10 .

The UE may adjust the PDCCH decoding rate in the scheduling CC or BWPbased on K0_(Scheduled) and K2_(Scheduled) values newly defined in thescheduled CC or BWP. A gap from a PDCCH to a PDSCH or a PUSCH that islikely to be scheduled may be different when there is a possibility thatthe PDCCH will performs cross-CC/BWP scheduling in a PDCCH decodingprocess and when there is no such possibility (i.e., self-CC/BWPscheduling). Accordingly, the minimum time K0 and/or K2 for decoding thePDCCH may be differently determined. The UE may assume a minimum time tobe consumed for PDCCH decoding to determine K0 and/or K2 as follows. TheUE may not expect that the BS will perform DL/UL data transmissionduring the minimum time to be consumed for PDCCH decoding.

(A) If a corresponding search space (SS) is available only forcross-CC/BWP scheduling DCI, the UE may assume the smaller ofK0_(Scheduled) and K2_(Scheduled) as the minimum time required for PDCCHdecoding or assume K2_(Scheduled) as the minimum time required for PDCCHdecoding.

(B) If the corresponding SS is available only for self-CC/BWP schedulingDCI, the UE may assume the smaller of the existing K0 and K2 values asthe minimum time required for PDCCH decoding, assume the smaller of theminimum applicable K0 and minimum applicable K2 as the minimum timerequired for PDCCH decoding, or assume the minimum applicable K2 as theminimum time required for PDCCH decoding.

(C) If the corresponding SS is available for both self-CC/BWP schedulingDCI and cross-CC/BWP scheduling DCI, the UE may assume a minimum valueof the minimum time required for PDCCH decoding according to (A) and theminimum time required for PDCCH decoding according to (B) as the minimumtime required for PDCCH decoding.

According to an embodiment of the present disclosure, if a first CC or afirst BWP cross-schedules a PDSCH in a second CC or a second BWP havinga different numerology (SCS) therefrom, a scheduling delay (K1) value ofa PUCCH (a channel including HARQ-ACK/NACK information for a scheduledPDSCH) that the UE expects may be defined as follows.

The slot offset K1 applied to a CC or BWP in which the PUCCH istransmitted may be defined as min_K1×2^((uPUCCH-uPDCCH))+K1′.

min_K1 may be the minimum applicable K1 configured in a CC or a BWP inwhich the PUCCH is transmitted. uPUCCH may denote a μ valuecorresponding to the numerology of the CC or the BWP in which the PUCCHis transmitted among the μ values of Table 7. uPDCCH may denote a μvalue corresponding to the numerology of the scheduling CC or BWP amongthe values of Table 7. K1′ may denote a K1 value in the CC or BWP inwhich the PUCCH is transmitted (e.g., a K1 value applied to the CC/BWPin which the PUCCH related to cross-CC/BWP scheduling is transmitted incross-CC/BWP scheduling according to the existing method).

According to an embodiment of the present disclosure, when thenumerologies of multiple CCs or multiple BWPs configured for the UE aredifferent as in the case in which the first CC or the first BWPcross-schedules the PDSCH in the second CC or the second BWP having adifferent numerology (SCS) therefrom, a method of configuring theminimum applicable K0, K1, or K2 value may be defined as follows.

For example, the UE/BS may configure the minimum applicable K0, K1 or K2value for each numerology (regardless of a CC or a BWP).

According to an embodiment of the present disclosure, the UE/BS mayconfigure/determine the number of slots based on a specific referencenumerology μ1 (regardless of the numerology of a corresponding CC or acorresponding BWP) as a first minimum applicable K0, K1, or K2 valueK0_(min), K1_(min), or K2_(min). The UE/BS may obtain a second minimumapplicable K0, K1, or K2 value to be applied to the corresponding CC orthe corresponding BWP by scaling the first minimum applicable K0, K1, orK2 value K0_(min), K1_(min), or K2_(min) based on a ratio between anumerology μ2 of a corresponding CC or a corresponding BWP to whichK0_(min), K1_(min), or K2_(min) is to be applied and the referencenumerology μ1.

For example, the UE/BS may scale the first applicable K0, K1, or K2value K0_(min), K1_(min), or K2_(min) in proportion to the ratio (e.g.,2^(μ2)/2^(μ1)) between the numerology μ2 of the corresponding CC or BWPand the reference numerology μ1. “Proportion” may be understood asmeaning that, when the first minimum applicable K0 related to thereference numerology μ1 is represented as K0_(min), the UE/BS determinesthe second minimum applicable K0 based on “K0_(min)×2^(μ2)/2^(μ1)”.Likewise, “Proportion” may be understood as meaning that, when the firstminimum applicable K2 related to the reference numerology μ1 isrepresented as K2_(min), the UE/BS determines the second minimumapplicable K2 based on “K2_(min)×2^(μ2)/2^(μ1)”.

For example, the reference numerology may be defined as 15 kHz and 120kHz in frequency range 1 (FR1) and frequency range 2 (FR2) of NR,respectively.

As another example, the reference numerology may be the numerology of aBWP previously used by the UE/BS. For example, whiletransmitting/receiving a signal through a first BWP configured with afirst numerology, if the UE/BS intends to transmit/receive the signalthrough a new second BWP configured with a second numerology, the UE/BSmay determine the second minimum applicable K0, K1 or K2value in the newsecond BWP configured with the second numerology.

The UE/BS may determine the second minimum applicable K0, K1 or K2valuein the new second BWP based on the reference numerology μ1 of the firstnumerology of the previously used first BWP. For example, as describedabove, the UE/BS may determine the second minimum applicable K0, K1 orK2value in proportion to “2^(μ2)/2^(μ1)”. More specifically, the UE/BSmay determine the second minimum applicable K0 value based on“K0_(min)×2^(μ2)/2^(μ1)”, where K0_(min) may denote the first minimumapplicable K0 configured in the first BWP. Upon receiving DCI forscheduling PDSCH reception in the second BWP in slot n, the UE mayassume/expect that the DCI will not indicate a K0 value smaller than thesecond minimum applicable K0. The BS may not expect that the UE that hasreceived the DCI for scheduling PDSCH reception in the second BWP inslot n will perform PDSCH reception based on the K0 value smaller thanthe second minimum applicable K0. The UE that has received the DCI forscheduling PDSCH reception in the second BWP in slot n may not beexpected to perform PDSCH reception based on the K0 value smaller thanthe second minimum applicable K0. Additionally, the UE/BS may determinethe second minimum applicable K2 value based on“K2_(min)×2^(μ2)/2^(μ1)”, where K2_(min) may denote the second minimumapplicable K0 configured in the first BWP. Upon receiving the DCI forscheduling PUSCH transmission in the second BWP in slot n, the UE mayassume/expect that the DCI will not indicate a K2 value smaller than thesecond minimum applicable K2. The BS may not expect that the UE that hasreceived the DCI for scheduling PUSCH transmission in the second BWP inslot n will perform PUSCH transmission based on the K2 value smallerthan the second minimum applicable K2. The UE that has received the DCIfor scheduling PUSCH transmission in the second BWP in slot n may not beexpected to perform PUSCH transmission based on the K2 value smallerthan the second minimum applicable K2. On the other hand, an initial BWPused by the UE/BS during initial access may be used as the referencenumerology. For example, while the UE/BS transmits and receives a signalthrough the initial BWP, if the UE/BS desires to change to the BWP to anew BWP, signal transmission/reception in the new BWP may be performedas in the above-described process by configuring the numerology of theinitial BWP as the reference numerology.

As another example, the reference numerology may be defined as a minimumnumerology among the numerologies of CC(s) or BWP(s) configured for theUE/BS.

Meanwhile, the term “minimum applicable K0” mentioned above may also bereferred to as the “minimum scheduling offset K0”. The term “minimumapplicable K2” may also be referred to as the “minimum scheduling offsetK2”.

When a plurality of BWPs is configured for one UE and numerologies(SCSs) are different for the respective BWPs, there may be an ambiguityproblem in applying the minimum scheduling offsets K0 and K2. In theproposed embodiment of the present disclosure, this problem may besolved by applying the minimum scheduling offsets K0 and K2 based on thereference numerology. The reference numerology may represent thenumerology of a specific BWP. For the UE that desires to change aninitial BWP, the reference numerology may be the numerology of theinitial BWP.

The UE may receive DCI for scheduling a PDSCH in the second BWP havingthe second numerology. The DCI may include indication information aboutthe minimum scheduling offset K0. The UE may receive the PDSCH byapplying the minimum scheduling offset K0 to the second BWP. In applyingthe minimum scheduling offset K0 indicated by the DCI to the second BWP,the UE may obtain/apply the minimum scheduling offset K0 using the firstnumerology of the first BWP as a reference. The first BWP may have beenused by the UE before the second BWP. Application of the minimumscheduling offset K0 may include scaling according to a ratio betweenthe first numerology and the second numerology.

The UE may receive DCI for scheduling a PUSCH in the second BWP havingthe second numerology. The DCI may include indication information aboutthe minimum scheduling offset K2. The UE may transmit the PUSCH byapplying the minimum scheduling offset K2 to the second BWP. In applyingthe minimum scheduling offset K2 indicated by the DCI to the second BWP,the UE may obtain/apply the minimum scheduling offset K0 using the firstnumerology of the first BWP as a reference. The first BWP may have beenused by the UE before the second BWP. Application of the minimumscheduling offset K2 may include scaling according to the ratio betweenthe first numerology and the second numerology.

According to an embodiment of the present disclosure, when the SCS ofthe second BWP is larger than the SCS of the first BWP, if the minimumscheduling offset K0 indicated by the DCI is applied to the second BWP,a problem that the PDSCH, which has not been buffered in the second BWPby the UE, is located after the minimum scheduling offset (e.g., aproblem that a corresponding PDSCH signal may not be buffered by the UEat a time when DCI decoding is completed) may be solved.

FIG. 13 illustrates signal transmission and reception according to anembodiment of the present disclosure.

In FIG. 13 , a wireless device 1 and a wireless device 2 may operate inthe same wireless communication system as different wirelesscommunication devices. The wireless communication system may be, forexample, a 3GPP-based wireless communication system. For convenience ofexplanation, it is assumed in FIG. 13 that the wireless device 1 is aUE, the wireless device 2 is a BS, and the UE and the BS transmit andreceive DCI through a PDCCH, but the scope of the present disclosure isnot limited thereto. As another example, the wireless device 1/wirelessdevice 2 may be a UE/UE (e.g., device-to-device (D2D) communication UEs,sidelink communication UEs, or vehicle-to-everything (V2X) UEs), a BS/BS(e.g., BSs supporting wireless backhaul or BSs supporting integratedaccess backhaul (IAB)), or a BS/UE (e.g., for UCItransmission/reception).

For example, the UE may access the BS through an initial accessprocedure (e.g., FIG. 15 ). In addition, as an example, the UE mayperform a DRX (e.g., FIG. 20 ) operation.

Referring to FIG. 13 , the UE may obtain information about a minimumapplicable offset min_K from the BS (1305). The minimum applicableoffset may include at least one of minimum applicable K0, K1, or K2. Theminimum applicable offset value(s) may be indicated through systeminformation or a higher layer (e.g., RRC) signal. A default value of theminimum applicable offset may be pre-defined. When the default value ofthe minimum applicable offset is used, step 1305 may be omitted.

The UE may receive DCI for scheduling data from the BS (1310). The DCImay include information about a PDCCH-to-data slot offset K. The DCI maybe received through a PDCCH, and data may be transmitted/receivedthrough a PDSCH/PUSCH.

The UE may perform data transmission/reception in a slot determinedbased on min_K and/or K according to the proposals of the presentdisclosure (1320).

A duration in which DL/UL transmission scheduling is not expected may beincluded (1315) between a DCI reception time (1310) and a datatransmission/reception time (1320), and the duration (1315) may beidentified based on min_K according to the proposals of the presentdisclosure.

FIG. 14 illustrates signal transmission and reception according to anembodiment of the present disclosure. FIG. 14 does not necessarilyconstitute an independent invention from FIG. 13 or from the previouslydescribed embodiments and may be an exemplary implementation of theaforementioned embodiments. A description in FIG. 14 should beunderstood as a non-limiting example that does not limit the scope ofthe present disclosure, and a description overlapping with thepreviously described content may be omitted.

In FIG. 14 , a wireless device 1 and a wireless device 2 may operate inthe same wireless communication system as different wirelesscommunication devices. The wireless communication system may be, forexample, a 3GPP-based wireless communication system. For convenience ofdescription, it is assumed in FIG. 13 that the wireless device 1 is aUE, the wireless device 2 is a BS, and the UE and the BS transmit andreceive DCI on a PDCCH, but the scope of the present disclosure is notlimited thereto. As another example, the wireless device 1/wirelessdevice 2 may be a UE/UE (e.g., D2D communication UEs, sidelinkcommunication UEs, or V2X UEs), a BS/BS (e.g., BSs supporting wirelessbackhaul or BSs supporting IAB), or a BS/UE (e.g., for UCItransmission/reception).

As an example, the UE may access the BS through an initial accessprocedure (e.g., FIG. 15 ). For example, the UE may perform a DRX (e.g.,FIG. 20 ) operation.

Referring to FIG. 14 , the BS may generate DCI (1405). The DCI may be DLgrant DCI for scheduling a PDSCH or UL grant DCI for scheduling a PUSCH.The DCI may schedule reception of the PDSCH or transmission of the PUSCHin a second BWP configured with a second SCS. At a time of generatingthe DCI, the BS may be in a state in which a first slot to which thecorresponding PDCCH is to be mapped and a second slot to which thecorresponding PDSCH/PUSCH is to be mapped have been determined. The DCImay be configured to include/indicate information regarding the slotoffset ‘K’ between the first slot and the second slot.

The BS may transmit the PDCCH carrying the DCI through a candidate inthe first slot among PDCCH candidates (1410). The BS may map the PDCCHto the candidate in the first slot among the PDCCH candidates.

The UE may monitor the PDCCH candidates (1415). As a result ofmonitoring the PDCCH candidates, the UE may obtain the DCI through thePDCCH detected in the first slot (1420). The UE may attempt to detectthe PDCCH by blind-decoding the PDCCH candidates.

In blind-decoding the PDCCH candidates, the UE may attempt to detect thePDCCH under the assumption that the corresponding DCI is the DL grantDCI and/or under the assumption that the corresponding DCI is the ULgrant DCI. In addition, the assumption of the DL grant DCI may beinterpreted as meaning that the UE assumes reception of the PDSCH, andthe assumption of the UL grant DCI may be interpreted as meaning thatthe UE assumes transmission of the PUSCH. For example, since the UEshould complete PDCCH detection and DCI acquisition before the secondslot, the UE may control a monitoring rate of the PDCCH candidates and aDCI decoding rate (and/or accompanying power consumption) inconsideration of the earliest time point at which PDSCH reception may bescheduled or the earliest time point at which PUSCH transmission may bescheduled.

The UE may receive the PDSCH or transmit the PUSCH in the second slotbased on the DCI (1425). The UE may determine, based on the slot offset‘K’ included in the DCI, the second slot in which reception of the PDSCHor transmission of the PUSCH is to be performed.

A minimum value ‘Min_K’ for the slot offset ‘K’ in the second BWP may bedetermined based on a first SCS configured in a first BWP different fromthe second BWP. For example, the first BWP may be a BWP that has beenpreviously used by the UE/BS.

The first SCS and the second SCS may be different.

In the case in which the second BWP is different from the first BWP, theUE/BS may determine the minimum value ‘Min_K’ based on a ratio betweenthe second SCS and the first SCS. For example, the minimum value ‘Min_K’may be determined to be proportional to the ratio between the second SCSand the first SCS. As a specific example, the minimum value ‘Min_K’ maybe determined based on “2^(μ2)/2^(μ1)”, where ‘μ1’ may denote a valueindicating the first SCS configured in the first BWP, and ‘μ2’ maydenote a value indicating the second SCS configured in the second BWP(e.g., see Table 7). The minimum value ‘Min_K’ may be determined basedon ‘(2^(μ2)/2^(μ1))*min_Slot_Offset’, where ‘min_Slot_Offset’ may denotethe minimum value ‘Min_K’ configured in the first BWP.

The UE may not be expected to perform PDSCH reception or PUSCHtransmission in a slot related to a ‘K’ value smaller than thedetermined minimum value ‘Min_K’. The BS may not expect that the UE willperform PDSCH reception or PUSCH transmission in the slot related to the‘K’ value smaller than the minimum value ‘Min_K’.

In the process of monitoring the PDCCH candidates and obtaining the DCI,the UE may assume that the DCI will not indicate the ‘K’ value smallerthan the minimum value ‘Min_K’. The BS may generate the DCI so as not toindicate the ‘K’ value smaller than the minimum value ‘Min_K’.

A BWP in which the PDCCH is detected may be different from the secondBWP in which PDSCH reception or PUSCH transmission is performed. The BWPin which the PDCCH is detected may be the first BWP or a third BWP.

The UE may receive, through RRC signaling, at least one of a first TDRAtable related to the PDSCH or a second TDRA table related to the PUSCH.The first TDRA table may include one or more PDCCH-to-PDSCH slot offset‘K0’ values. The second TDRA table may include one or morePDCCH-to-PUSCH slot offset ‘K2’ values. When the DCI is the DL grantDCI, the slot offset ‘K’ may be one of the ‘K0’ values of the first TDRAtable. Alternatively, when the DCI is the UL grant DCI, the slot offset‘K’ may be one of the ‘K2’ values of the second TDRA table.

When the minimum value ‘Min_K’ is a minimum value ‘Min_K0’ related tothe PDSCH (e.g., when the DCI is DL grant DCI or when the detection ofthe DL grant DCI is being attempted), the UE may assume that a valuesmaller than the minimum value ‘Min_K0’ among the ‘K0’ values of thefirst TDRA table is not indicated by the slot offset ‘K’). When theminimum value ‘Min_K’ is the minimum value ‘Min_K0’ related to thePDSCH, the BS may generate the DCI such that the slot offset ‘K’ doesnot indicate a value smaller than the minimum value ‘Min_K0’ among the‘K0’ values of the first TDRA table.

When the minimum value ‘Min_K’ is a minimum value ‘Min_K2’ related tothe PUSCH (e.g., when the DCI is UL grant DCI or when the detection ofthe UL grant DCI is being attempted), the UE may assume that a valuesmaller than the minimum value ‘Min_K2’ among the ‘K2’ values of thesecond TDRA table is not indicated by the slot offset ‘K’. When theminimum value ‘Min_K’ is the minimum value ‘Min_K2’ related to thePUSCH, the BS may generate the DCI such that the slot offset ‘K’ doesnot indicate a value smaller than the minimum value ‘Min_K2’ among the‘K2’ values of the second TDRA table.

The UE/BS may determine the minimum value ‘Min_K0’ as the minimum value‘Min_K’ related to the PDSCH. The UE/BS may determine the minimum value‘Min_K2’ as the minimum value ‘Min_K’ related to the PUSCH. The minimumvalue ‘Min_K0’ and the minimum value ‘Min_K2’ may be determinedindependently of each other.

Meanwhile, a plurality of CCs may be configured for the UE, and theUE/BS may support cross-carrier scheduling and/or cross-BWP scheduling.For example, the UE may perform monitoring of PDCCH candidates in aspecific BWP of a first CC. The UE may perform PDSCH reception or PUSCHtransmission in a second CC including the second BWP. The specific BWPmay be the first BWP but may be another BWP different from the firstBWP. The first BWP may be a BWP located in the first CC or a BWP locatedin the second CC. The UE may determine the second slot using the minimumvalue ‘Min_K’ configured for the specific BWP of the first CC. Forexample, the second slot may be slot #(n+m+k). “Slot #n” may denote aslot having the lowest index among slots of the second BWP overlappingwith a slot of the specific BWP in which the PDCCH is detected. “m” mayrepresent the minimum value ‘Min_K’ configured for the specific BWP asthe number of slots in the second BWP. “k” may denote a slot offsetindicated by the DCI as the number of slots in the second BWP.

The UE may perform a network access process to perform theafore-described/proposed procedures and/or methods. For example, whileaccessing the network (e.g., BS), the UE may receive system informationand configuration information required to perform theafore-described/proposed procedures and/or methods and store thereceived information in a memory. The configuration information requiredfor the present disclosure may be received by higher-layer (e.g., RRC ormedium access control (MAC)) signaling.

FIG. 15 is a diagram illustrating an initial network access andsubsequent communication process. In NR, a physical channel and an RSmay be transmitted by beamforming. When beamforming-based signaltransmission is supported, beam management may follow, for beamalignment between a BS and a UE. Further, a signal proposed by thepresent disclosure may be transmitted/received by beamforming. In RRCIDLE mode, beam alignment may be performed based on an SSB, whereas inRRC CONNECTED mode, beam alignment may be performed based on a CSI-RS(in DL) and an SRS (in UL). On the contrary, when beamforming-basedsignal transmission is not supported, beam-related operations in thefollowing description may be skipped.

Referring to FIG. 15 , a BS (e.g., eNB) may periodically transmit an SSB(S702). The SSB includes a PSS/SSS/PBCH. The SSB may be transmitted bybeam sweeping. The BS may then transmit remaining minimum systeminformation (RMSI) and other system information (OSI) (S704). The RMSImay include information required for initial access to the BS (e.g.,physical random access channel (PRACH) configuration information). Afterdetecting SSBs, the UE identifies the best SSB. The UE may then transmita random access channel (RACH) preamble (Message 1 or Msg1) in PRACHresources linked/corresponding to the index (i.e., beam) of the best SSB(S706). The beam direction of the RACH preamble is associated with thePRACH resources. Association between PRACH resources (and/or RACHpreambles) and SSBs (indexes) may be configured by system information(e.g., RMSI). Subsequently, in an RACH procedure, the BS may transmit arandom access response (RAR) (Msg2) in response to the RACH preamble(S708), the UE may transmit Msg3 (e.g., RRC Connection Request) based ona UL grant included in the RAR (S710), and the BS may transmit acontention resolution message (Msg4) (S720). Msg4 may include RRCConnection Setup.

When an RRC connection is established between the BS and the UE in theRACH procedure, beam alignment may subsequently be performed based on anSSB/CSI-RS (in DL) and an SRS (in UL). For example, the UE may receivean SSB/CSI-RS (S714). The SSB/CSI-RS may be used for the UE to generatea beam/CSI report. The BS may request the UE to transmit a beam/CSIreport, by DCI (S716). In this case, the UE may generate a beam/CSIreport based on the SSB/CSI-RS and transmit the generated beam/CSIreport to the BS on a PUSCH/PUCCH (S718). The beam/CSI report mayinclude a beam measurement result, information about a preferred beam,and so on. The BS and the UE may switch beams based on the beam/CSIreport (S720 a and S720 b).

Subsequently, the UE and the BS may perform the above-described/proposedprocedures and/or methods. For example, the UE and the BS may transmit awireless signal by processing information stored in a memory or mayprocess a received wireless signal and store the processed signal in thememory according to the proposals of the present disclosure, based onconfiguration information obtained in the network access process (e.g.,a system information acquisition process, an RRC connection processthrough an RACH, and so on). The wireless signal may include at leastone of a PDCCH, a PDSCH, or an RS on DL and at least one of a PUCCH, aPUSCH, or an SRS on UL.

Various descriptions, functions, procedures, proposals, methods, and/oroperational flow charts of the present disclosure may be applied to, butnot limited to, various fields requiring wirelesscommunication/connection (e.g., 5G) between devices.

With reference to the drawings, the present disclosure will be describedin greater detail. In the following drawings/description, like referencenumerals may denote the same or corresponding hardware blocks, softwareblocks, or functional blocks, unless otherwise specified.

FIG. 16 illustrates a communication system 1 applied to the presentdisclosure.

Referring to FIG. 16 , a communication system 1 applied to the presentdisclosure includes wireless devices, Base Stations (BSs), and anetwork. Herein, the wireless devices represent devices performingcommunication using Radio Access Technology (RAT) (e.g., 5G New RAT(NR)) or Long-Term Evolution (LTE)) and may be referred to ascommunication/radio/5G devices. The wireless devices may include,without being limited to, a robot 100 a, vehicles 100 b-1 and 100 b-2,an eXtended Reality (XR) device 100 c, a hand-held device 100 d, a homeappliance 100 e, an Internet of Things (IoT) device 100 f, and anArtificial Intelligence (AI) device/server 400. For example, thevehicles may include a vehicle having a wireless communication function,an autonomous driving vehicle, and a vehicle capable of performingcommunication between vehicles. Herein, the vehicles may include anUnmanned Aerial Vehicle (UAV) (e.g., a drone). The XR device may includean Augmented Reality (AR)/Virtual Reality (VR)/Mixed Reality (MR) deviceand may be implemented in the form of a Head-Mounted Device (HMD), aHead-Up Display (HUD) mounted in a vehicle, a television, a smartphone,a computer, a wearable device, a home appliance device, a digitalsignage, a vehicle, a robot, etc. The hand-held device may include asmartphone, a smartpad, a wearable device (e.g., a smartwatch or asmartglasses), and a computer (e.g., a notebook). The home appliance mayinclude a TV, a refrigerator, and a washing machine. The IoT device mayinclude a sensor and a smartmeter. For example, the BSs and the networkmay be implemented as wireless devices and a specific wireless device200 a may operate as a BS/network node with respect to other wirelessdevices.

The wireless devices 100 a to 100 f may be connected to the network 300via the BSs 200. An AI technology may be applied to the wireless devices100 a to 100 f and the wireless devices 100 a to 100 f may be connectedto the AI server 400 via the network 300. The network 300 may beconfigured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g.,NR) network. Although the wireless devices 100 a to 100 f maycommunicate with each other through the BSs 200/network 300, thewireless devices 100 a to 100 f may perform direct communication (e.g.,sidelink communication) with each other without passing through theBSs/network. For example, the vehicles 100 b-1 and 100 b-2 may performdirect communication (e.g. Vehicle-to-Vehicle(V2V)/Vehicle-to-everything (V2X) communication). The IoT device (e.g.,a sensor) may perform direct communication with other IoT devices (e.g.,sensors) or other wireless devices 100 a to 100 f.

Wireless communication/connections 150 a, 150 b, or 150 c may beestablished between the wireless devices 100 a to 100 f/BS 200, or BS200/BS 200. Herein, the wireless communication/connections may beestablished through various RATs (e.g., 5G NR) such as uplink/downlinkcommunication 150 a, sidelink communication 150 b (or, D2Dcommunication), or inter BS communication (e.g. relay, Integrated AccessBackhaul (IAB)). The wireless devices and the BSs/the wireless devicesmay transmit/receive radio signals to/from each other through thewireless communication/connections 150 a and 150 b. For example, thewireless communication/connections 150 a and 150 b may transmit/receivesignals through various physical channels. To this end, at least a partof various configuration information configuring processes, varioussignal processing processes (e.g., channel encoding/decoding,modulation/demodulation, and resource mapping/demapping), and resourceallocating processes, for transmitting/receiving radio signals, may beperformed based on the various proposals of the present disclosure.

FIG. 17 illustrates wireless devices applicable to the presentdisclosure.

Referring to FIG. 17 , a first wireless device 100 and a second wirelessdevice 200 may transmit radio signals through a variety of RATs (e.g.,LTE and NR). Herein, {the first wireless device 100 and the secondwireless device 200} may correspond to {the wireless device 100 x andthe BS 200} and/or {the wireless device 100 x and the wireless device100 x} of FIG. 16 .

The first wireless device 100 may include one or more processors 102 andone or more memories 104 and additionally further include one or moretransceivers 106 and/or one or more antennas 108. The processor(s) 102may control the memory(s) 104 and/or the transceiver(s) 106 and may beconfigured to implement the descriptions, functions, procedures,proposals, methods, and/or operational flowcharts disclosed in thisdocument. For example, the processor(s) 102 may process informationwithin the memory(s) 104 to generate first information/signals and thentransmit radio signals including the first information/signals throughthe transceiver(s) 106. The processor(s) 102 may receive radio signalsincluding second information/signals through the transceiver 106 andthen store information obtained by processing the secondinformation/signals in the memory(s) 104. The memory(s) 104 may beconnected to the processor(s) 102 and may store a variety of informationrelated to operations of the processor(s) 102. For example, thememory(s) 104 may store software code including commands for performinga part or the entirety of processes controlled by the processor(s) 102or for performing the descriptions, functions, procedures, proposals,methods, and/or operational flowcharts disclosed in this document.Herein, the processor(s) 102 and the memory(s) 104 may be a part of acommunication modem/circuit/chip designed to implement RAT (e.g., LTE orNR). The transceiver(s) 106 may be connected to the processor(s) 102 andtransmit and/or receive radio signals through one or more antennas 108.Each of the transceiver(s) 106 may include a transmitter and/or areceiver. The transceiver(s) 106 may be interchangeably used with RadioFrequency (RF) unit(s). In the present disclosure, the wireless devicemay represent a communication modem/circuit/chip.

The second wireless device 200 may include one or more processors 202and one or more memories 204 and additionally further include one ormore transceivers 206 and/or one or more antennas 208. The processor(s)202 may control the memory(s) 204 and/or the transceiver(s) 206 and maybe configured to implement the descriptions, functions, procedures,proposals, methods, and/or operational flowcharts disclosed in thisdocument. For example, the processor(s) 202 may process informationwithin the memory(s) 204 to generate third information/signals and thentransmit radio signals including the third information/signals throughthe transceiver(s) 206. The processor(s) 202 may receive radio signalsincluding fourth information/signals through the transceiver(s) 106 andthen store information obtained by processing the fourthinformation/signals in the memory(s) 204. The memory(s) 204 may beconnected to the processor(s) 202 and may store a variety of informationrelated to operations of the processor(s) 202. For example, thememory(s) 204 may store software code including commands for performinga part or the entirety of processes controlled by the processor(s) 202or for performing the descriptions, functions, procedures, proposals,methods, and/or operational flowcharts disclosed in this document.Herein, the processor(s) 202 and the memory(s) 204 may be a part of acommunication modem/circuit/chip designed to implement RAT (e.g., LTE orNR). The transceiver(s) 206 may be connected to the processor(s) 202 andtransmit and/or receive radio signals through one or more antennas 208.Each of the transceiver(s) 206 may include a transmitter and/or areceiver. The transceiver(s) 206 may be interchangeably used with RFunit(s). In the present disclosure, the wireless device may represent acommunication modem/circuit/chip.

Hereinafter, hardware elements of the wireless devices 100 and 200 willbe described more specifically. One or more protocol layers may beimplemented by, without being limited to, one or more processors 102 and202. For example, the one or more processors 102 and 202 may implementone or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP,RRC, and SDAP). The one or more processors 102 and 202 may generate oneor more Protocol Data Units (PDUs) and/or one or more Service Data Unit(SDUs) according to the descriptions, functions, procedures, proposals,methods, and/or operational flowcharts disclosed in this document. Theone or more processors 102 and 202 may generate messages, controlinformation, data, or information according to the descriptions,functions, procedures, proposals, methods, and/or operational flowchartsdisclosed in this document. The one or more processors 102 and 202 maygenerate signals (e.g., baseband signals) including PDUs, SDUs,messages, control information, data, or information according to thedescriptions, functions, procedures, proposals, methods, and/oroperational flowcharts disclosed in this document and provide thegenerated signals to the one or more transceivers 106 and 206. The oneor more processors 102 and 202 may receive the signals (e.g., basebandsignals) from the one or more transceivers 106 and 206 and acquire thePDUs, SDUs, messages, control information, data, or informationaccording to the descriptions, functions, procedures, proposals,methods, and/or operational flowcharts disclosed in this document.

The one or more processors 102 and 202 may be referred to ascontrollers, microcontrollers, microprocessors, or microcomputers. Theone or more processors 102 and 202 may be implemented by hardware,firmware, software, or a combination thereof. As an example, one or moreApplication Specific Integrated Circuits (ASICs), one or more DigitalSignal Processors (DSPs), one or more Digital Signal Processing Devices(DSPDs), one or more Programmable Logic Devices (PLDs), or one or moreField Programmable Gate Arrays (FPGAs) may be included in the one ormore processors 102 and 202. The descriptions, functions, procedures,proposals, methods, and/or operational flowcharts disclosed in thisdocument may be implemented using firmware or software and the firmwareor software may be configured to include the modules, procedures, orfunctions. Firmware or software configured to perform the descriptions,functions, procedures, proposals, methods, and/or operational flowchartsdisclosed in this document may be included in the one or more processors102 and 202 or stored in the one or more memories 104 and 204 so as tobe driven by the one or more processors 102 and 202. The descriptions,functions, procedures, proposals, methods, and/or operational flowchartsdisclosed in this document may be implemented using firmware or softwarein the form of code, commands, and/or a set of commands.

The one or more memories 104 and 204 may be connected to the one or moreprocessors 102 and 202 and store various types of data, signals,messages, information, programs, code, instructions, and/or commands.The one or more memories 104 and 204 may be configured by Read-OnlyMemories (ROMs), Random Access Memories (RAMs), Electrically ErasableProgrammable Read-Only Memories (EPROMs), flash memories, hard drives,registers, cash memories, computer-readable storage media, and/orcombinations thereof. The one or more memories 104 and 204 may belocated at the interior and/or exterior of the one or more processors102 and 202. The one or more memories 104 and 204 may be connected tothe one or more processors 102 and 202 through various technologies suchas wired or wireless connection.

The one or more transceivers 106 and 206 may transmit user data, controlinformation, and/or radio signals/channels, mentioned in the methodsand/or operational flowcharts of this document, to one or more otherdevices. The one or more transceivers 106 and 206 may receive user data,control information, and/or radio signals/channels, mentioned in thedescriptions, functions, procedures, proposals, methods, and/oroperational flowcharts disclosed in this document, from one or moreother devices. For example, the one or more transceivers 106 and 206 maybe connected to the one or more processors 102 and 202 and transmit andreceive radio signals. For example, the one or more processors 102 and202 may perform control so that the one or more transceivers 106 and 206may transmit user data, control information, or radio signals to one ormore other devices. The one or more processors 102 and 202 may performcontrol so that the one or more transceivers 106 and 206 may receiveuser data, control information, or radio signals from one or more otherdevices. The one or more transceivers 106 and 206 may be connected tothe one or more antennas 108 and 208 and the one or more transceivers106 and 206 may be configured to transmit and receive user data, controlinformation, and/or radio signals/channels, mentioned in thedescriptions, functions, procedures, proposals, methods, and/oroperational flowcharts disclosed in this document, through the one ormore antennas 108 and 208. In this document, the one or more antennasmay be a plurality of physical antennas or a plurality of logicalantennas (e.g., antenna ports). The one or more transceivers 106 and 206may convert received radio signals/channels etc. from RF band signalsinto baseband signals in order to process received user data, controlinformation, radio signals/channels, etc. using the one or moreprocessors 102 and 202. The one or more transceivers 106 and 206 mayconvert the user data, control information, radio signals/channels, etc.processed using the one or more processors 102 and 202 from the baseband signals into the RF band signals. To this end, the one or moretransceivers 106 and 206 may include (analog) oscillators and/orfilters.

FIG. 18 illustrates another example of a wireless device applied to thepresent disclosure. The wireless device may be implemented in variousforms according to a use-case/service (refer to FIG. 16 ).

Referring to FIG. 18 , wireless devices 100 and 200 may correspond tothe wireless devices 100 and 200 of FIG. 17 and may be configured byvarious elements, components, units/portions, and/or modules. Forexample, each of the wireless devices 100 and 200 may include acommunication unit 110, a control unit 120, a memory unit 130, andadditional components 140. The communication unit may include acommunication circuit 112 and transceiver(s) 114. For example, thecommunication circuit 112 may include the one or more processors 102 and202 and/or the one or more memories 104 and 204 of FIG. 17 . Forexample, the transceiver(s) 114 may include the one or more transceivers106 and 206 and/or the one or more antennas 108 and 208 of FIG. 17 . Thecontrol unit 120 is electrically connected to the communication unit110, the memory 130, and the additional components 140 and controlsoverall operation of the wireless devices. For example, the control unit120 may control an electric/mechanical operation of the wireless devicebased on programs/code/commands/information stored in the memory unit130. The control unit 120 may transmit the information stored in thememory unit 130 to the exterior (e.g., other communication devices) viathe communication unit 110 through a wireless/wired interface or store,in the memory unit 130, information received through the wireless/wiredinterface from the exterior (e.g., other communication devices) via thecommunication unit 110.

The additional components 140 may be variously configured according totypes of wireless devices. For example, the additional components 140may include at least one of a power unit/battery, input/output (I/O)unit, a driving unit, and a computing unit. The wireless device may beimplemented in the form of, without being limited to, the robot (100 aof FIG. 16 ), the vehicles (100 b-1 and 100 b-2 of FIG. 16 ), the XRdevice (100 c of FIG. 16 ), the hand-held device (100 d of FIG. 16 ),the home appliance (100 e of FIG. 16 ), the IoT device (100 f of FIG. 16), a digital broadcast terminal, a hologram device, a public safetydevice, an MTC device, a medicine device, a fintech device (or a financedevice), a security device, a climate/environment device, the AIserver/device (400 of FIG. 16 ), the BSs (200 of FIG. 16 ), a networknode, etc. The wireless device may be used in a mobile or fixed placeaccording to a use-example/service.

In FIG. 18 , the entirety of the various elements, components,units/portions, and/or modules in the wireless devices 100 and 200 maybe connected to each other through a wired interface or at least a partthereof may be wirelessly connected through the communication unit 110.For example, in each of the wireless devices 100 and 200, the controlunit 120 and the communication unit 110 may be connected by wire and thecontrol unit 120 and first units (e.g., 130 and 140) may be wirelesslyconnected through the communication unit 110. Each element, component,unit/portion, and/or module within the wireless devices 100 and 200 mayfurther include one or more elements. For example, the control unit 120may be configured by a set of one or more processors. As an example, thecontrol unit 120 may be configured by a set of a communication controlprocessor, an application processor, an Electronic Control Unit (ECU), agraphical processing unit, and a memory control processor. As anotherexample, the memory 130 may be configured by a Random Access Memory(RAM), a Dynamic RAM (DRAM), a Read Only Memory (ROM)), a flash memory,a volatile memory, a non-volatile memory, and/or a combination thereof.

FIG. 19 illustrates a vehicle or an autonomous driving vehicle appliedto the present disclosure. The vehicle or autonomous driving vehicle maybe implemented by a mobile robot, a car, a train, a manned/unmannedAerial Vehicle (AV), a ship, etc.

Referring to FIG. 19 , a vehicle or autonomous driving vehicle 100 mayinclude an antenna unit 108, a communication unit 110, a control unit120, a driving unit 140 a, a power supply unit 140 b, a sensor unit 140c, and an autonomous driving unit 140 d. The antenna unit 108 may beconfigured as a part of the communication unit 110. The blocks110/130/140 a to 140 d correspond to the blocks 110/130/140 of FIG. 18 ,respectively.

The communication unit 110 may transmit and receive signals (e.g., dataand control signals) to and from external devices such as othervehicles, BSs (e.g., gNBs and road side units), and servers. The controlunit 120 may perform various operations by controlling elements of thevehicle or the autonomous driving vehicle 100. The control unit 120 mayinclude an Electronic Control Unit (ECU). The driving unit 140 a maycause the vehicle or the autonomous driving vehicle 100 to drive on aroad. The driving unit 140 a may include an engine, a motor, apowertrain, a wheel, a brake, a steering device, etc. The power supplyunit 140 b may supply power to the vehicle or the autonomous drivingvehicle 100 and include a wired/wireless charging circuit, a battery,etc. The sensor unit 140 c may acquire a vehicle state, ambientenvironment information, user information, etc. The sensor unit 140 cmay include an Inertial Measurement Unit (IMU) sensor, a collisionsensor, a wheel sensor, a speed sensor, a slope sensor, a weight sensor,a heading sensor, a position module, a vehicle forward/backward sensor,a battery sensor, a fuel sensor, a tire sensor, a steering sensor, atemperature sensor, a humidity sensor, an ultrasonic sensor, anillumination sensor, a pedal position sensor, etc. The autonomousdriving unit 140 d may implement technology for maintaining a lane onwhich a vehicle is driving, technology for automatically adjustingspeed, such as adaptive cruise control, technology for autonomouslydriving along a determined path, technology for driving by automaticallysetting a path if a destination is set, and the like.

For example, the communication unit 110 may receive map data, trafficinformation data, etc. from an external server. The autonomous drivingunit 140 d may generate an autonomous driving path and a driving planfrom the obtained data. The control unit 120 may control the drivingunit 140 a such that the vehicle or the autonomous driving vehicle 100may move along the autonomous driving path according to the driving plan(e.g., speed/direction control). In the middle of autonomous driving,the communication unit 110 may aperiodically/periodically acquire recenttraffic information data from the external server and acquiresurrounding traffic information data from neighboring vehicles. In themiddle of autonomous driving, the sensor unit 140 c may obtain a vehiclestate and/or surrounding environment information. The autonomous drivingunit 140 d may update the autonomous driving path and the driving planbased on the newly obtained data/information. The communication unit 110may transfer information about a vehicle position, the autonomousdriving path, and/or the driving plan to the external server. Theexternal server may predict traffic information data using AItechnology, etc., based on the information collected from vehicles orautonomous driving vehicles and provide the predicted trafficinformation data to the vehicles or the autonomous driving vehicles.

FIG. 20 is a diagram illustrating a DRX operation of a UE according toan embodiment of the present disclosure.

The UE may perform a DRX operation in the afore-described/proposedprocedures and/or methods. A UE configured with DRX may reduce powerconsumption by receiving a DL signal discontinuously. DRX may beperformed in an RRC_IDLE state, an RRC_INACTIVE state, and anRRC_CONNECTED state. The UE performs DRX to receive a paging signaldiscontinuously in the RRC_IDLE state and the RRC_INACTIVE state. DRX inthe RRC_CONNECTED state (RRC_CONNECTED DRX) will be described below.

Referring to FIG. 20 , a DRX cycle includes an On Duration and anOpportunity for DRX. The DRX cycle defines a time interval betweenperiodic repetitions of the On Duration. The On Duration is a timeperiod during which the UE monitors a PDCCH. When the UE is configuredwith DRX, the UE performs PDCCH monitoring during the On Duration. Whenthe UE successfully detects a PDCCH during the PDCCH monitoring, the UEstarts an inactivity timer and is kept awake. On the contrary, when theUE fails in detecting any PDCCH during the PDCCH monitoring, the UEtransitions to a sleep state after the On Duration. Accordingly, whenDRX is configured, PDCCH monitoring/reception may be performeddiscontinuously in the time domain in the afore-described/proposedprocedures and/or methods. For example, when DRX is configured, PDCCHreception occasions (e.g., slots with PDCCH SSs) may be configureddiscontinuously according to a DRX configuration in the presentdisclosure. On the contrary, when DRX is not configured, PDCCHmonitoring/reception may be performed continuously in the time domain.For example, when DRX is not configured, PDCCH reception occasions(e.g., slots with PDCCH SSs) may be configured continuously in thepresent disclosure. Irrespective of whether DRX is configured, PDCCHmonitoring may be restricted during a time period configured as ameasurement gap.

Table 9 describes a DRX operation of a UE (in the RRC_CONNECTED state).Referring to Table 9, DRX configuration information is received byhigher-layer signaling (e.g., RRC signaling), and DRX ON/OFF iscontrolled by a DRX command from the MAC layer. Once DRX is configured,the UE may perform PDCCH monitoring discontinuously in performing theafore-described/proposed procedures and/or methods, as illustrated inFIG. 5 .

TABLE 9 Type of signals UE procedure 1^(st) step RRC signalling ReceiveDRX configuration (MAC- information CellGroupConfig) 2^(nd) Step MAC CEReceive DRX command ((Long) DRX command MAC CE) 3^(rd) Step — Monitor aPDCCH during an on-duration of a DRX cycle

MAC-CellGroupConfig includes configuration information required toconfigure MAC parameters for a cell group. MAC-CellGroupConfig may alsoinclude DRX configuration information. For example, MAC-CellGroupConfigmay include the following information in defining DRX.

-   -   Value of drx-OnDurationTimer: defines the duration of the        starting period of the DRX cycle.    -   Value of drx-InactivityTimer: defines the duration of a time        period during which the UE is awake after a PDCCH occasion in        which a PDCCH indicating initial UL or DL data has been detected    -   Value of drx-HARQ-RTT-TimerDL: defines the duration of a maximum        time period until a DL retransmission is received after        reception of a DL initial transmission.    -   Value of drx-HARQ-RTT-TimerDL: defines the duration of a maximum        time period until a grant for a UL retransmission is received        after reception of a grant for a UL initial transmission.    -   drx-LongCycleStartOffset: defines the duration and starting time        of a DRX cycle.    -   drx-ShortCycle (optional): defines the duration of a short DRX        cycle.

When any of drx-OnDurationTimer, drx-InactivityTimer,drx-HARQ-RTT-TimerDL, and drx-HARQ-RTT-TimerDL is running, the UEperforms PDCCH monitoring in each PDCCH occasion, staying in the awakestate.

Upon generating/mapping/transmitting the PDCCH for/to/to the UE, the BSmay transmit the PDCCH in the On Duration so that the UE may detect thePDCCH.

The above-described embodiments correspond to combinations of elementsand features of the present disclosure in prescribed forms. And, therespective elements or features may be considered as selective unlessthey are explicitly mentioned. Each of the elements or features can beimplemented in a form failing to be combined with other elements orfeatures. Moreover, it is able to implement an embodiment of the presentdisclosure by combining elements and/or features together in part. Asequence of operations explained for each embodiment of the presentdisclosure can be modified. Some configurations or features of oneembodiment can be included in another embodiment or can be substitutedfor corresponding configurations or features of another embodiment. And,it is apparently understandable that an embodiment is configured bycombining claims failing to have relation of explicit citation in theappended claims together or can be included as new claims by amendmentafter filing an application.

Those skilled in the art will appreciate that the present disclosure maybe carried out in other specific ways than those set forth hereinwithout departing from the spirit and essential characteristics of thepresent disclosure. The above embodiments are therefore to be construedin all aspects as illustrative and not restrictive. The scope of thedisclosure should be determined by the appended claims and their legalequivalents, not by the above description, and all changes coming withinthe meaning and equivalency range of the appended claims are intended tobe embraced therein.

INDUSTRIAL APPLICABILITY

The present disclosure is applicable to UEs, BSs, or other apparatusesin a wireless mobile communication system.

The invention claimed is:
 1. A method of transmitting or receiving asignal by a user equipment (UE) in a wireless communication system, themethod comprising: monitoring physical downlink control channel (PDCCH)candidates; obtaining downlink control information (DCI) through a PDCCHdetected in a first slot as a result of monitoring the PDCCH candidates;and receiving a physical downlink shared channel (PDSCH) or transmittinga physical uplink shared channel (PUSCH) in a second slot based on theDCI, wherein the DCI schedules the reception of the PDSCH or thetransmission of the PUSCH in a second bandwidth part (BWP) configuredwith a second subcarrier spacing (SCS) and the DCI is configured toinclude information about a slot offset ‘K’ between the first slot andthe second slot, wherein the UE determines, based on the slot offset‘K’, the second slot in which the reception of the PDSCH or thetransmission of the PUSCH is to be performed, wherein a minimum value‘Min_K’ for the slot offset ‘K’ in the second BWP is determined based ona first SCS configured in a first BWP different from the second BWP, andwherein a ratio between the second SCS and the first SCS is used todetermine the minimum value ‘Min_K’ based on that the first BWP and thesecond BWP are different from each other.
 2. The method of claim 1,wherein the UE is not expected to receive the PDSCH or transmit thePUSCH in a slot related to a ‘K’ value smaller than the determinedminimum value ‘Min_K’.
 3. The method of claim 1, wherein the UE assumesthat the DCI will not indicate a ‘K’ value smaller than the determinedminimum value ‘Min_K’ in a process of monitoring the PDCCH candidatesand acquiring the DCI.
 4. The method of claim 1, wherein the first BWPis a BWP which has been previously used by the UE.
 5. The method ofclaim 1, wherein the minimum value ‘Min_K’ is determined to beproportional to the ratio between the second SCS and the first SCS. 6.The method of claim 1, wherein the minimum value ‘Min_K’ is determinedbased on ‘2^(μ2)/2^(μ1)’, where ‘μ1’ is a value denoting the first SCSconfigured in the first BWP and ‘μ2’ is a value denoting the second SCSconfigured in the second BWP.
 7. The method of claim 6, wherein theminimum value ‘Min_K’ is determined based on‘(2^(μ2)/2^(μ1))*min_Slot_Offset’, where ‘min_Slot)Offset’ denotes theminimum value ‘Min_K’ configured in the first BWP.
 8. The method ofclaim 1, wherein a BWP in which the PDCCH is detected is different fromthe second BWP in which reception of the PDSCH or transmission of thePUSCH is performed.
 9. The method of claim 1, further comprising:receiving at least one of a first time domain resource allocation (TDRA)table related to the PDSCH or a second TDRA table related to the PUSCH,through radio resource control (RRC) signaling, wherein the first TDRAtable includes one or more PDCCH-to-PDSCH slot offset ‘K0’ values,wherein the second TDRA table includes one or more PDCCH-to-PUSCH slotoffset ‘K2’ values, and wherein the slot offset ‘K’ is one of the ‘K0’values of the first TDRA table or one of the ‘K2’ values of the secondTDRA table.
 10. The method of claim 9, wherein the UE assumes that,based on the minimum value ‘Min_K’, which is a minimum value ‘Min_K0’related to the PDSCH, a value smaller than the minimum value ‘Min_K0’among the ‘K0’ values of the first TDRA table is not indicated ‘Min_K0’‘K0’ by the slot offset ‘K’, or wherein the UE assumes that, based onthe minimum value ‘Min_K’ which is a minimum value ‘Min_K2’ related tothe PUSCH, a value smaller than the minimum value ‘Min_K2’ among the‘K2’ values of the second TDRA table is not indicated ‘Min_K2’ ‘K2’ bythe slot offset ‘K’.
 11. The method of claim 1, wherein the UEdetermines a minimum value ‘Min K0’ as the minimum value ‘Min_K’ relatedto the PDSCH and determines a minimum value ‘Min_K2’ as the minimumvalue ‘Min_K’ related to the PUSCH, and wherein the minimum value ‘MinK0’ and the minimum value ‘Min_K2’ are determined independently of eachother.
 12. The method of claim 1, wherein the monitoring the PDCCHcandidates is performed in a specific BWP of a first component carrier(CC) among a plurality of CCs configured for the UE, wherein thereceiving the PDSCH or the transmitting the PUSCH is performed in asecond CC including the second BWP, and wherein the UE determines thesecond slot using a minimum value ‘Min_K’ configured for the specificBWP of the first CC.
 13. The method of claim 12, wherein the second slotis slot #(n+m+k), where “slot #n” denotes a slot having a lowest indexamong slots of the second BWP overlapping with a slot of the specificBWP in which the PDCCH is detected, “m” denotes the minimum value‘Min_K’ configured for the specific BWP as the number of slots in thesecond BWP, and “k” denotes a slot offset indicated by the DCI as thenumber of slots in the second BWP.
 14. A device for performing signalprocessing for wireless communication, the device comprising: at leastone processor configured to execute one or more instructions; and amemory configured to provide a reading/writing space in the at least oneprocessor, wherein the at least one processor is configured to performsignal processing related to monitoring of physical downlink controlchannel (PDCCH) candidates based on execution of the one or moreinstructions, acquire downlink control information (DCI) through a PDCCHdetected in a first slot as a result of monitoring the PDCCH candidates,and perform signal processing related to reception of a physicaldownlink shared channel (PDSCH) or transmission of a physical uplinkshared channel (PUSCH) in a second slot based on the DCI, wherein theDCI schedules reception of the PDSCH or transmission of the PUSCH in asecond bandwidth part (BWP) configured with a second subcarrier spacing(SCS) and the DCI is configured to include information about a slotoffset ‘K’ between the first slot and the second slot, wherein the atleast one processor determines the second slot in which reception of thePDSCH or transmission of the PUSCH is to be performed based on the slotoffset ‘K’, wherein a minimum value ‘Min_K’ for the slot offset ‘K’ inthe second BWP is determined based on a first SCS configured in a firstBWP different from the second BWP, and wherein a ratio between thesecond SCS and the first SCS is used to determine the minimum value‘Min_K’ based on that the first BWP and the second BWP are differentfrom each other.
 15. A method of transmitting or receiving a signal by abase station (BS) in a wireless communication system, the methodcomprising: generating downlink control information (DCI); transmittinga physical downlink control channel (PDCCH) carrying the DCI through acandidate in a first slot among PDCCH candidates; and transmitting aphysical downlink shared channel (PDSCH) or receiving a physical uplinkshared channel (PUSCH), scheduled by the DCI in a second slot, whereinthe DCI schedules transmission of the PDSCH or reception of the PUSCH ina second bandwidth part (BWP) configured with a second subcarrierspacing (SCS) and the DCI is configured to include information about aslot offset ‘K’ between the first slot and the second slot, wherein theBS indicates the second slot in which transmission of the PDSCH orreception of the PUSCH is to be performed based on the slot offset ‘K’,wherein a minimum value ‘MinK’ for the slot offset ‘K’ in the second BWPis determined based on a first SCS configured in a first BWP differentfrom the second BWP, and wherein a ratio between the second SCS and thefirst SCS is used to determine the minimum value ‘MinK’ based on thatthe first BWP and the second BWP are different from each other.
 16. Abase station (BS) for wireless communication, the BS comprising: atransceiver; and at least one processor configured to generate downlinkcontrol information (DCI), wherein the at least one processor isconfigured to control the transceiver to transmit a physical downlinkcontrol channel (PDCCH) carrying the DCI through a candidate in a firstslot among PDCCH candidates, and transmit a physical downlink sharedchannel (PDSCH) or receive a physical uplink shared channel (PUSCH),scheduled by the DCI in a second slot, wherein the DCI schedulestransmission of the PDSCH or reception of the PUSCH in a secondbandwidth part (BWP) configured with a second subcarrier spacing (SCS)and the DCI is configured to include information about a slot offset ‘K’between the first slot and the second slot, wherein the at least oneprocessor indicates the second slot in which transmission of the PDSCHor reception of the PUSCH is to be performed based on the slot offset‘K’, wherein a minimum value ‘Min_K’ for the slot offset ‘K’ in thesecond BWP is determined based on a first SCS configured in a first BWPdifferent from the second BWP, and wherein a ratio between the secondSCS and the first SCS is used to determine the minimum value ‘Min_K’based on that the first BWP and the second BWP are different from eachother.
 17. The device of claim 14, further comprising: a transceiverconfigured to transmit or receive a radio signal under control of theprocessor.
 18. The device of claim 17, wherein the device is a userequipment (UE).
 19. A non-transitory medium which is readable by aprocessor and storing instructions which cause the processor to performthe method of claim 1.